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句子1In a countercurrent exchange system,the blood vessels carrying cooled blood from the flippers run close enough to the blood vessels carrying warm blood from the body to pick up some heat from the warmer blood vessels;thus,the heat is transferred from the outgoing to the ingoing vessels before it reaches the flipper itself.【难点解析】本句的难点在于复杂的后置定语干扰了阅读，给我们理解句子带来了影响。
在这个句子中就是现在分词短语carrying cooled blood…做了后置定语，造成了主语the blood vessels 和谓语run被分割，后面接着出现了另一个the blood vessels carrying warm blood……，进一步加大了理解难度，让我们一时无法理清句子结构。
找到这种后置定语，划分句子主干的时候直接忽视这种修饰性成分，句子的主要信息就变得非常清晰：In a countercurrent exchange system,the blood vessels carrying cooled blood from the flippers[定语]run close enough to the blood vessels carrying warm blood from the body[定语]to pick up some heat from the warmer blood vessels;thus,the heat is transferred from the outgoing to the ingoing vessels before it reaches the flipper itself.完成了句子主干划分之后，根据汉语的表述顺序，将后置定语往前放，这样整个句子的意思就出来了。
托福长难句120句解析一、句子解析1. The professor's lecture was so convoluted that it was difficult for the students to follow.解析：这个句子中，convoluted意为“复杂的”，表示教授的讲座内容非常复杂，以至于学生很难理解和跟随。
2. Despite her extensive preparation, she struggled with the difficult questions on the exam.解析：这个句子中，despite意为“尽管”，表示尽管她做了大量的准备工作，但仍然在考试中遇到了困难的问题。
3. The author uses a series of rhetorical questions to engage the reader and provoke thought.解析：这个句子中，rhetorical questions意为“修辞性问题”，表示作者使用了一系列的修辞性问题来吸引读者并引发思考。
4. The government's decision to increase taxes was met with widespread opposition from the public.解析：这个句子中，met with意为“遭遇”，表示政府增税的决定受到了公众的广泛反对。
5. The new technology has the potential to revolutionize the way we live and work.解析：这个句子中，has the potential to意为“有潜力”，表示新技术有潜力彻底改变我们的生活和工作方式。
6. The company's profits have plummeted as a result of the economic downturn.解析：这个句子中，plummeted意为“暴跌”，表示由于经济衰退，公司的利润暴跌。
1. Accordingto conventional theory， yawning takes place when people are bored or sleepy andserves the function of increasing alertness by reversing， through deeperbreathing， the drop in blood oxygen levels that are caused by the shallowbreathing that accompanies lack of sleep or boredom.【译文】根据传统的理论，当人们无聊或者困倦的时候，打哈欠会出现。
打哈欠通过深呼吸来逆转血液中氧含量的降低，从而的起到提高警觉的功能。
而血液中氧含量的降低是由浅呼吸导致的，而浅呼吸又伴随着缺觉或无聊。
2. The keyfactor in the success of these countries （along with high literacy， whichcontributed to it） was their ability to adapt to the international division oflabor determined by the earlyindustrializers and to stake out areas ofspecialization in international markets for which they were especially wellsuited.【译文】这些国家成功的关键因素（促成这个因素的是高识字率）是他们有能力适应由早期的工业化国家决定的劳动力国际分工并占领了他们特别适合的国际市场中的专业化领域。
3. In the second case， pollinators（insects， birds） obtain food from the flowering plant， and the plant has itspollen distributed and seeds dispersed much more efficiently than they would beif they were carried by the wind only.【译文】在第二个案例中，传粉者（昆虫和鸟）从开花植物中获取食物，而植物也使得它们的花粉和种子相比于只通过风传播的更加高效。
The frequency with which certain simple motifs appear in these oldest sites has led rock-art researchers to adopt a descriptive term—the Panaramitee style—a label which takes its name from the extensive rock pavements at Panaramitee North indesert South Australia, which are covered with motifs pecked into the surface.(TPO23, 51) motif /məʊ'tiːf/ n. 装饰的图案或式样;(⾳乐的)乐旨,(⽂学的)主题. term n. 术语 peck /pek/ v. 以喙啄 ⼤家⾃⼰先读，不回读，看⼀遍是否能理解 The frequency (with which certain simple motifs appear in these oldest sites) has led rock-art researchers to adopt a descriptive term—the Panaramitee style—alabel (which takes its name from the extensive rock pavements at Panaramitee North in desertSouth Australia),(which are covered with motifs pecked into the surface.) (TPO23, 51) 托福阅读长难句100句分析： 这个句⼦的主⼲：The frequency has led rock-art researchers to adopt a descriptive term 注意这⾥的lead...to短语 修饰⼀：(with which certain simple motifs appear in these oldest sites) ，从句，修饰the frequency 中⽂：⼀些简单图案出现在这些最古⽼遗址上 修饰⼆：(which takes its name from the extensive rock pavements at Panaramitee North in desert South Australia) ，从句修饰a label，注意这个从句⾥⾯还有两个介词短语： which takes its name (from the extensive rock pavements)(at Panaramitee North in desert South Australia) (from the extensive rock pavements) ，来⾃宽⼴的岩⽯路⾯ (at Panaramitee North in desert South Australia)，在澳⼤利亚南部沙漠Panaramitee North 中⽂：取名于在澳⼤利亚南部沙漠Panaramitee North宽⼴的岩⽯路⾯ 修饰三：(which are covered with motifs pecked into the surface.) ，从句，修饰rock pavements，注意这个从句⾥⾯还有个⾮谓语动词： which are covered with motifs (pecked into the surface.) (pecked into the surface.)，刻进路⾯ 中⽂：这些路⾯被刻进表⾯的图案所覆盖 托福阅读长难句100句参考翻译： ⼀些简单图案出现在这些最古⽼遗址上的频率使得岩⽯艺术研究⼈员采⽤了⼀个描述性的术语——Panaramitee风格——这个称号取名于在澳⼤利亚南部沙漠Panaramitee North宽⼴的岩⽯路⾯，这些路⾯被刻进表⾯的图案所覆盖。
托福阅读中的一句长难句讲解This nascent world system developed as a result of insatiable demands for nonlocal raw materials in different ecological regions where societies were developing along very similar evolutionary tracks toward greater complexity.本句话是来自tpo63：The Sumerians and Regional Interdependence 苏美尔人与区域相互依存这一句的难点在于：词汇难，术语多，结构复杂. 上下文逻辑理困难.第一步：句子成分划分和翻译同学们可以自己先划分句子成分，再看老师的划分。
This nascent world system + developed[ as a result of insatiable demands for nonlocal raw materials/ in different ecological regions]（where societies + were developing /along very similar evolutionary tracks/ toward greater complexity. )这句话主要有2部分：（一）主干句：主语：This nascent world system 谓语：developed 状语：as a result of insatiable demands for nonlocal raw materials in different ecological regions.这是一个有3个介词短语组成的状语结构：① as a result of insatiable demands由于贪得无厌的需求② (demands) for nonlocal raw materials对非本地的原材料的需求③ in different ecological regions（原材料）来自不同的生态区域⭐️难点2：这一些较难的生词/术语：1️⃣ nascent：“初生的、萌芽的”。
托福阅读考试长难句分析托福阅读长难句分析(1)In order for the structure to achieve the size and strength necessary to meet itspurpose, architecture employs methods of support that, because they are based on physical laws, have changed little since people first discovered them——evenwhile building materials have changed dramatically.(44)大家先自己理解，多想想，先别看解析，看不明白，再看下面的解析。
(In order for the structure) (to achieve the size and strength necessary to meet its purpose), architecture employs methods of support that, (because they are based on physical laws), have changed little since people first discovered them—— (even while building materials have changed dramatically. )老邪分析：一个句子重点在于主干，看懂了主干，就看懂了句子的主要成分。
以下主干为句子中红色部分，括号里均是修饰成分。
修饰一：(In order for the structure)，介词短语修饰二：(to achieve the size and strength necessary to meet its purpose)，非谓语做形容词性修饰structure修饰三：(because they are based on physical laws)，插入语，插入语记得先跳过去，断句别出问题，that和have changed是在一起的。
新托福阅读长难句120句(分析+译文)1。
Totally without light and subjected to intense pressures hundreds of times greater than at the Earth’s surface，the deep—ocean bottom is a hostile environment to humans，in some ways as forbidding and remote as the void of outer space。
(定语后置in some ways…)由于完全没有光，而且承受着比在地球表面大数百倍的极大压力，深海底部对人类而言是一个充满敌意的环境，在某些方面就像外层空间一样险恶和遥远。
分句1：Totally without light and subjected to intense pressures分句2：hundreds of times greater than at the Earth’s surface分句3:the deep—ocean bottom is a hostile environment to humans分句4：in some ways as forbidding and remote as the void of outer space分句2修饰分句1结尾的短语intense pressures,分句1是分句3的原因状语分句3是整个长句子的主句分句4是分句3的后置定语，修饰分句3的a hostile environment to humans整个句子结构是：原因状语+主句+后置定语这是主句前后分别有状语和定语的修饰成分，但是本句其实不是复合句。
句子的核心意思是深海对于人类而言是一个充满敌意的环境。
2。
Basic to any understanding of Canada in the 20 years after the要理解二战之后20年中的加拿大，就必须了解该国惊人的人口增长。
托福阅读长难句200句和详细解析同学们，有没有这样的情况发生?一个句子当中每一个单词你都认识，但你看不懂这句话，这个感觉是不是十分的诡异?托福阅读长难句因为词汇只是基础，句子才是交流最基本的单位，看阅读是看句子，句子看不懂就是啥也没懂。
小编为大家列举200句及对应解析，希望帮助大家掌握理解长难句的分析方法，攻克这一难关。
1. Even the kind of stability defined as simple lack of change is not always associated with maximum diversity.2. Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.3. Their seed heads raised just high enough above the ground to catch the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water content.4. By contrast, in the United States an estimated 97 million birds are killed each year when they collide with buildings made of plate glass, 57 million are killed on highways each year; at least 3.8 million die annually from pollution and poisoning; and millions of birds are electrocuted each year by transmission and distribution lines carrying power produced by nuclear and coal power plants.5. A recent Douglas biographer states:" The deer which once picturesquely dotted the meadows around the fort were gone [in 1832], hunted to extermination in order to protect the crops."6. Scientists first identified this impact in 1980 from the worldwide layer of sediment deposited from the dust cloud that enveloped the planet after the impact.7. Only a few organisms especially tolerant of very salty conditions remained.8. Paleontologists have argued for a long time that the demise of the dinosaurs was caused by climatic alterations associated with slow changes in the positions of continents and seas resulting from plate tectonics.9. The answer may be that virtually all the water on Mars is now locked in the permafrost layer under the surface, with more contained in the planet’s polar caps.10. But belief in this ice-free corridor began to crumble when paleoecologist Glen MacDonald demonstrated that some of the most important radiocarbon dates used to support the existence of an ice-free corridor were incorrect.11. Spores light enough to float on the breezes were carried thousands of miles from more ancient lands and deposited at random across the bare mountain flanks.12. Interestingly enough, several of these hydrodynamic adaptations resemble features designed to improve the aerodynamics of high-speed aircraft.13. Those queried ranged from European college students to members of the Fore, a tribe that dwells in the New Guinea highlands.第五类14. Perceiving an apparent connection between certain actions performed by the group and the result it desires, the group repeats, refines and formalizes those actions into fixed ceremonies, or rituals.15. One, set forth by Aristotle in the fourth century B.C., sees humans as naturally imitative—as taking pleasure in imitating persons, things, and actions and in seeing such imitations.16. A more complicated system is, in general, more likely than a simple system to break down.17. The killing of birds of prey by wind turbines has pitted environmentalists who champion wildlife protection against environmentalists who promote renewable wind energy.18. Second, conservation has been insured by limiting times for and types of hunting.19. It has been suggested that these figurines were an ideal type or an expression of a desire for fertility.20. A third likely explanation for infantile amnesia involves incompatibilities between the ways in which infants encode information and the ways in which older children and adults retrieve it.21. Whether people can remember an event depends critically on the fit between the way in which they earlier encoded the information and the way in which they later attempt to retrieve it.22. Critics also point out that the shallow seaways had retreated from and advanced on the continents numerous times during the Mesozoic, so why did the dinosaurs survive the climatic changes associated with the earlier fluctuations but not with this one?23. This would have created a barrier of ice extending from the Alaska Peninsula, through the Gulf of Alaska and southward along the Northwest Coast of North America to what is today the state of Washington.24. Teachers, it is thought, benefit from the practice of reflection, the conscious act of thinking deeply about and carefully examining the interactions and events within their own classrooms.25. They describe the initial understanding in the teachers with whom they were working as being "utilitarian...and not rich or detailed enough to drive systematic reflection."26. Liston (1987) point out the inconsistency between the role of the teacher asa (reflective) professional decision maker and the more usual role of the teacher asa technician, putting into practice the ideas of others.27. Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans.28. Sociobiology views much social behavior, including aggressive behavior, as genetically determined.29. The Democrats tended to view society as a continuing conflict between "the people”-farmers, planters, and workers-and a set of greedy aristocrats.30. Nor did the Whigs envision any conflict in society between farmers and workers on the one hand and businesspeople and bankers on the other.解析：1、系好安全带能够挽救性命，它能将丧生和重伤的概率减少一半以上。
托福黄金阅读技巧：长难句分析长难句是我们做托福阅读是最怕遇到的，现在小编分享一些长难句分析给大家，希望对你们的学习有帮助。
长难句分析：二战之后的加拿大Basic to any understanding of Canada in the 20 years after the Second World War is the country's impressive population growth.(倒装结构Basic to any understanding…is…)要理解二战之后20年中的加拿大，就必须了解该国惊人的人口增长。
分句1：Basic to any understanding of Canada in the 20 years after the Second World War分句2：is分句3：the country's impressive population growth分句1，2，3共同构成倒装句，正常的语序应该是3，2，1，即：该句的正常语序是The country's impressive population growth is basic to any understanding of Canada in the 20 years after the Second World War.本句是一个简单句，只不过使用了倒装，谓语动词是is.长难句分析：昆虫的数量The fact that half of the known species are thought to inhabit the world's rain forests does not seem surprising，considering the huge numbers of insects that comprise the bulk of the species.(同位语从句fact that…;定语从句that comprise the bulk…)【译句】考虑到组成大部分物种的昆虫的巨大数量，认为半数的已知物种栖息在世界的雨林中这一事实看起来并不令人吃惊。
Although we now tend to refer to the various crafts according to the materials used to construct them-clay, glass, wood, fiber, and metal-it was once common to think of crafts in terms of function, which led to their being known as the “applied arts.”（OG-Applied arts and fine arts）长难句类型：抽象词难度：3语法分析：Although we now tend to refer to the various crafts according to the materials used to construct them-clay, glass, wood, fiber, and metal-it was once common to think of crafts in terms of function, which led to their being known as the “applied arts.”译文：尽管现在我们倾向于根据工艺品的制造材料——比如黏土、玻璃、木头、纤维以及金属——对他们进行分类，但根据工艺品的功能进行分类（这一做法）在过去曾经很流行，（这一做法）导致了这些工艺品被称作“实用艺术”。
解释：这句话的前半句，也就是让步的部分并不难，难就难在后面的转折部分，it是形式主语，真正的主语是“to think of crafts in terms of function”这一做法，而后面which引导的定语从句也正是修饰前面的“to think of crafts in terms of function”这一做法，这句话是全文的第一句，事实上作者是在做一个背景导入，根据这句话，我们可知，下面要讲的就“是实用艺术”。
If, with greater caution, we assume lower totals in the early eighteenth century and only 400 million in 1850, we still face a startling fact: something like a doubling of the vast Chinese population in the century before Western contact,foreign trade, and industrialization could have had much effect. (本句字来自TPO48，共有49个单词)
如果小心一些，我们假设在18世纪初总人数较低，并且在1850年也只有4亿，我们依然面对一个吃惊的事实：在与西方接触、对外贸易和工业化之前，在这个世纪中国的巨大人口数量翻倍本应产生很大的影响。
Depending on the location, time of year, and time of day, any or all of the following differences between cities and their surroundings can be important: albedo (reflectivity of the surface), surface roughness, emissions of heat, emissions of moisture, and emissions of particles that affect net radiation and the growth of cloud droplets. (本句子来自TPO48，共53个单词~)
位置、一年中的不同时段、一天中的不同时间，以及城市和周围的环境之间的任何差异都可能是重要的：反照率(表面反射率)、表面粗糙度、热量的排放、湿气的散发、影响净辐射的微粒散发和云滴的增长。
Darwin’s theory was that the succession from one coral reef type to another could be achieved by the upward growth of coral from a sinking platform, and that there would be a progression from a fringin greef, through the barrier reef stage until, with the disappearance through subsidence (sinking) of the central island, only a reef-enclosed lagoon or atoll would survive.本句子来自TPO47，有62个单词
达尔文的理论是：一种珊瑚礁种类可以通过从一个正在下沉的平面上向上生长演化成为另一种种类，并且，通过岸礁就演变到堡礁，直到由于中央岛因为下沉消失了，只剩下珊瑚环绕的泻湖或环礁保存下来。
Researchers D. Tilman and J A. Downing used the ratio of above-ground biomass in 1988(after two years of drought) to that in 1986 (predrought) in 207 plots in agrassland field in the Cedar Creek Natural History Area in Minnesota as anindex of ecosystem response to disruption by drought. 本句子来自TPO46，共51个单词
The room shown in it closely resembles the room in other Vermeer paintings, with lighting coming from a window on the left, the same roof beams, and similar floor tiles, suggesting that the room was fitted with a camera obscura on the side in the foreground.本句子来自TPO44，长达46个英文单词
画中展示的房间与在Vermeer其它画中的房间特别相似，光线从左边窗户照入，一样的屋顶横梁，相似的地板，这表明房内前面旁边位置装有一个暗箱。
The key to understand the modern success of grasses is thus to identify the situations in which the attributes of grasses as well as their defense mechanisms are superior to those of other plants, and to ducument how plant eaters and the environments they live in have changed through the ages.这个句子出自2月18日托福阅读B卷真题
整句话翻译为：因此，理解草本植物现今成功的关键是去确定在什么情况下草本植物的属性特点以及它们的防御机制会优于其他植物的(属性特点以及防御机制)，并且去记录吃草者和它们所居住的环境随着时间如何发生变化。
Dinosaurs rapidly became extinct about 65 million years ago as part of a mass extinction known as the K-T event, because it is associated with a geological signature known as the K-T boundary, usually a thin band of sedimentation found in various parts of the world. (K is the traditional abbreviation for the Cretaceous, derived from the German name Kreideieit)
大约在6500万年前，恐龙迅速地灭绝，成为K-T大规模灭绝事件的一部分，被称作K-T是因为它与地质学上的标签K-T边界有关，K-T边界通常是一块在世界各地都能找到的薄薄的沉积带。
(K在惯例上是白垩纪Cretaceous的缩写，源自德国名字kreidezeit)
A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal frame and steel wire of the finest quality, finally produced an instrument capable of myriad tonal effects from the most delicate harmonies to an almost orchestral fullness of sound，from a liquid，singing tone to a sharp, percussive brilliance
持续到19世纪的一系列机械上的改进，包括引入踏板以维持音调或使其柔和，改善金属框架，以及使用最佳牲能的钢丝，最终产生了一种具备无数音调效果的乐器——这些效果涵盖了从最精致的和声到几乎全部的管弦乐音响，从明快流畅的吟唱音调到尖锐的打击乐器的恢弘气氛。
有没有理解对呢？
The answer to the first question is that carbon dioxide is still found in abundance on Earth, but now, instead of being in the form of atmospheric carbon dioxide, it is either dissolved in the oceans or chemically bound into carbonate rocks, such as the limestone and marble that formed in the oceans.
第一个问题的答案是，在地球上二氧化碳依然可以大量被找到，但是现在，它不是以大气中的二氧化碳的形式出现，它溶解在海洋里或者通过化学作用进入碳酸盐岩中，例如在海洋中形成的石灰石和大理石。
