从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。
From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.
我们现在知道，这是一个在火星上发现化石生命证据的好地方。
We now know that, this is a good place to look for evidence of fossil life on Mars.
我们现在住在火星上的一个新城市，在这儿生活很好，我们在我们的新家都很开心。
We're now living in a new city on Mars. Life here is very nice, and we are happy in our new home.
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