数十年来，科学家一直都想弄清楚一个问题：火星的大气为何如此稀薄？不过现在人们想搞清楚的问题变成：为什么火星已经完全没有大气了？

For decades, scientists have pondered why Mars has such a thin atmosphere, but now we wonder: why does it have not any atmosphere left at all?

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他多次过去重复的这，并且浆糊串成为长期，更加众多，越来越稀薄，把变成最后非常美好的面条。

This he repeats many times over and the strings of paste become longer, more numerous, thinner and thinner, turning finally into very fine noodles.

youdao

他多次过去重复的这，并且浆糊串成为长期，更加众多，越来越稀薄，把变成最后非常美好的面条。

This he repeats many times over and the strings of paste become longer, more numerous, thinner and thinner, turning finally into very fine noodles.

youdao