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新概念英语第一册63课课文

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新概念英语第一册63课课文

Lesson 63 A glass envelope

In the previous lessons, we have learned about the history of the envelope. Today, we will

introduce a new type of envelope called the glass envelope. A glass envelope is commonly used

in the field of electronics and is an essential component of various devices such as vacuum

tubes and light bulbs.

A glass envelope is a sealed glass container that protects delicate electronic components and

ensures their proper functioning. It is made from high-quality borosilicate or soda-lime

glass, which is known for its excellent thermal resistance and electrical insulation

properties. The glass envelope is carefully designed to withstand high temperatures and

pressure differentials, making it suitable for a wide range of applications.

The manufacturing process of a glass envelope involves several intricate steps. First, the

glass is melted in a furnace at extremely high temperatures. The molten glass is then shaped

into a tube or a bulb using various techniques, including blowing and pressing. Next, the tube

or bulb is carefully cooled and annealed to relieve internal stresses and strengthen the glass

structure.

After the glass envelope is formed, it undergoes a series of rigorous tests to ensure its

quality and performance. The envelope is checked for any defects or impurities that may affect

its functionality. Moreover, it is subjected to high-voltage tests to measure its electrical

insulation properties and ensure it can withstand the required voltage.

Once the glass envelope passes all the tests, it is ready to be used in electronic devices.

Vacuum tubes, for example, rely on glass envelopes to maintain a vacuum inside, which is

crucial for their operation. Light bulbs also utilize glass envelopes to protect the filament

and provide a controlled environment for the emission of light.

In conclusion, the glass envelope is an important component in the field of electronics. Its

ability to withstand high temperatures and pressure differentials, along with its excellent

electrical insulation properties, make it an ideal choice for various electronic devices.

Without the glass envelope, many of the devices we use today would not be possible.。

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新概念英语第一册课文详注

新概念英语第一册课文详注

新概念英语第一册课文详注

想要学好英语的你，怎能错过新概念英语?今天给大家带来新概念英语第一册课文详注,希望能够帮助到大家，下面就和大家分享，来欣赏一下吧。

新概念英语第一册课文详注Lesson7~12

新概念英语第一册课文详注Lesson7~8

1.My names = My name is。

这是自我介绍时通常使用的句型：My name is…(后面加上自己的姓名)。有时也可用Im…这一句型。

2.Are you French，too?你也是法国人吗?

在英语中，too和either两个词都表示"也"的意思，然而too仅用于肯定句中，either 则限于用在否定句中。too和either一般都放在句末，且前面通常用逗号隔开。例如：

Is Sophie Italian, too?

索菲娅也是意大利人吗?

Is Robert a keyboard operator, too?

罗伯特也是电脑录入员吗? 3.What nationality are you?你是哪国人?

此问句用来询问对方的国籍。也可以问

Where are you from?或

Where do you come from?

4.Whats your job?你是做什么工作的?

Whats =What is。询问对方从事何种职业时还可以说：What

do you do?

5.Im an engineer.我是工程师。

Im=I am。口语中经常使用这种缩略形式。英语不定冠词有两个：a，an。在发音以元音音素开头的词前面用an，在发音以辅音音素开头的词前面用a。 engineer的发音是以元音音素开头的，所以前面要用an。(可参见第5-6课_Nice to meet you中的有关说明。)

6.数字16～20的英文写法

16-sixteen 17-seventeen 18-eighteen

《新概念英语》第三册第一课的课文

《新概念英语》第三册第一课的课文

《新概念英语》第三册第一课的课文

Lesson1 A puma at large

Pumas are large, cat-like animals which are found in America. When reports came into London Zoo that

a wild puma had been spotted forty-five miles south of London, they were not taken seriously. However, as

the evidence began to accumulate, experts from the Zoo felt obliged to investigate, for the descriptions given

by people who claimed to have seen the puma were extraordinarily similar.

The hunt for the puma began in a small village where a woman picking blackberries saw 'a large cat' only

five yards away from her. It immediately ran away when she saw it, and experts confirmed that a puma will

not attack a human being unless it is cornered（adj.被困得走投无路的）. The search proved difficult, for the

puma was often observed at one place in the morning and at another place twenty miles away in the evening.

新概念英语第一册第63课Lesson63课文单词知识点

新概念英语第一册第63课Lesson63课文单词知识点

Lesson63

DOCTOR: How's Jimmy today?

MRS. WILLIAMAS: Better. Thank you, Doctor.

DOCTOR: Can I see him please, Mrs. Williams?

MRS. WILLIAMS: Certainly, doctor. Come upstairs.

DOCTOR: You look very well, Jimmy. You are better now,

but you mustn't get up yet.

You must stay in bed for another two days.

DOCTOR: The boy mustn't go to school yet,

Mrs. Williams. And he mustn't eat rich food.

MRS. WILLIAMS: Does he have a temperature, doctor?

DOCTOR: No, he doesn't.

MRS. WILLIAMS: Must he stay in bed?

DOCTOR: Yes. He must remain in bed for another two

days. He can get up for about two hours each day,

but you must keep the room warm.

DOCTOR: Where's Mr. Williams this evening?

MRS. WILLIAMS: He's in bed, doctor.

Can you see him please? He has a bad cold, too! 医 生：吉米今天怎么样了?

威廉斯夫人：他好些了。谢谢您，医生。

新概念第二册63课课文同步练习

新概念第二册63课课文同步练习

精心整理

新概念第二册63课课文同步练习

一、close多种意思，细读下列句子并指出close的意思。

a) near in space b) near in relationship c) on the brink of,

at the edge of

d) almost even e) thorough f) shut g) stale, stuffy h)

tight i) stop running

1. When she heard the news, the girl was close to tears.

2. It was a close contest between the two candidates for the

Student Union.

3. Will you close the windows before you leave the house?

4. It was so close in the room that it became uncomfortable.

5. The supermarket closes at 9:30.

6. Joe is my closest friend at school.

7. The factory that keeps pouring polluted water into the river

has been told to close down.

8. You should keep a close watch on that man.

9. The boy always wants to stay close to his mother.

10. The man was close to tears at the sight of his long lost

sister.

11. This part of the road was closed for repair.