如果，如许多科学家所相信的那样，生命能够在适当的环境条件下迅速出现的话，很可能地球上不再只一次出现生命。
If, as many scientists believe, life can readily emerge under the right environmental conditions, it is possible that life arose on Earth more than once.
如果，如许多科学家所相信的那样，生命能够在适当的环境条件下迅速出现的话，很可能地球上不再只一次出现生命。
If, as many scientists believe, life can readily emerge under the right environmental conditions, it is possible that life arose on Earth more than once.
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