... 地球上过去的生命 lesson the past life of the earth 地球上生命的起源 the origins of life on earth 地球外智慧生命 extraterrestrial intelligence ...
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关于地球上生命的起源有好几种说法。
There are several sayings about the origins of life on earth.
地球上生命的起源是个使天文学家感兴趣的问题。
The origin of life on earth is a question that interests astronomers.
它不但敦请家长而且还有老师，向孩子们提供地球上生命的起源和进化的事实。
It urged parents as well as teachers to provide children with the facts about the origins and evolution of life on Earth.
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