即使火星大气中存在甲烷，它也很稀薄，并且仅存在于大气低层。(be confined to…)If methane exists at all in Mars’s

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问题即使火星大气中存在甲烷，它也很稀薄，并且仅存在于大气低层。(be confined to…)

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答案 If methane exists at all in Mars’s air, it is rare and confined to low levels of the atmosphere.

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