The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.
地球是人类的摇篮，但人类不能永远呆在摇篮里。
-- Konstantin Tsiolkovsky 齐奥尔科夫斯基
The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.
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The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.
地球是人类的摇篮，但人类不能永远呆在摇篮里。
-- Konstantin Tsiolkovsky 齐奥尔科夫斯基
