实际上，每一个阿波罗成员都带回一种深刻的印象：地球是那么脆弱。
Virtually every Apollo astronaut came back with a deep sense of the earth's fragility.
自然是短暂的：地球很脆弱，而且处于崩溃的危险中。
Nature is ephemeral: Earth is fragile and it is in danger of collapse.
自然是短暂的：地球很脆弱，而且处于崩溃的危险中。
Nature is ephemeral: Earth is fragile and it is in danger of collapse.
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