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来源:雅诚德英语网
Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favored bats that make a go of the night-hunting trade.
考虑到夜间可以生存,并且其他白天的交易已经被全部占有,自然选择偏爱可以成功在夜间捕食的蝙蝠。