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The surface of the Earth is the shore of the cosmic ocean. From it we have learned most of what we know. Recently, we have waded a little out to sea, enough to dampen our toes or, at most, wet our ankles. The water seems inviting. The ocean calls. So.

地球表面是宇宙海洋的海岸。我们从中学到了我们所知道的大部分东西。最近，我们涉水出海了一点，弄湿了脚趾头，最多弄湿了脚踝。水似乎很诱人。海洋的电话。所以。

— Carl Sagan 卡尔·萨根