As Earth - dwellers, we always cherish the hope that we will be visited by little green men and that we will be able to communicate with them.

作为地球上的居民，我们总存有这样的希望：小绿人来拜访我们，而我们可以和他们交流。

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That is our charge now - you are the last, best hope of Earth. We ask you to protect it, or we and all living things we cherish are history.

现在这是我们的责任了。你们是地球最后的、最美好的希望，我们请求你们保护它，否则，我们及我们所珍惜的一切，都将成为历史。

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Anyway, we should cherish what the earth offers us and try to save more for our later generations.

不管怎样，我们应该珍惜地球为我们提供的并尽力为我们的后代多省下些。

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Garan, a NASA spaceflyer on his second spaceflight, is the creator of the blog Fragile Oasis, which he launched before leaving Earth as a way to share his experiences (and the experiences of other astronauts) to inspire people to cherish the beauty and wonder of the Earth.

MSN: Earth From Space: An Astronaut's Quest to Protect Our 'Fragile Oasis' - Technology & science - Space - Space.com | NBC News