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.

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