冰层与变化着的二部的二氧化碳从没有完全消失过,所
以我们无法知道在南部的冰层下是否也存在着冰水层(左图)。这种现象的原因还不知道,但或许是由于火星赤道面与其运行轨道之间的夹角的 长期变化引起气候的变化造成的。或许在火星表面下较深处也有水存在。这种因季节变化而产生的两极覆盖层的变化使火星的气压改变了%左右。 (由海盗号测量出)。但是通过哈勃望远镜的观察却表明海盗号当时勘测时的环境并非是典型的情况。火星的大气似乎比海盗号勘测出的更冷、
Reading good books is like having a conversation with the highly worthy person of the past who wrote them; indeed, it is like having a prepared conversation in which those persons disclose to us only their best thinking.
—Descartes
读好书就像与那些极其值得尊重的昔日的作 者们交流,其实,这就像在进行一次准备好的谈 话,作者们在向我们透露他们的最佳见解。
—笛卡儿
Module 1 重点词汇
translate, translation, correct, number, repeat, pronunciation, writing, spelling, term, advice, write down, mistake, notebook, else, radio, newspaper, message, pen friend, each, other, excellent, orchestra, language, improve, basic, watch, guess, just, yourself, enjoy yourself, conversation, deep, breath, smile, remember, all the time, accent, wish, group, mark, club,