环绕火星飞行两年之久的欧洲航天器发现的初步结果表明火星大气中并不存在甲烷。(give a thumbs-down)

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问题 环绕火星飞行两年之久的欧洲航天器发现的初步结果表明火星大气中并不存在甲烷。(give a thumbs-down)

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答案Preliminary results from a European craft that has been circling Mars for the past two years, give a thumbs-down to the idea that there is methane in its atmosphere.

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