我们稍后会回到这些议题上，但我想谈谈罗宾·邓巴的理论——他是牛津大学的人类学家。
We'll come back to these issues in a minute, but I'd like to say something about the theories of Robin Dunbar—an anthropologist at Oxford University.
从理论上讲，把非洲猎豹引进美国西部，可以让叉角羚重新回到生物学家所说的自然进化轨道上。
Importing African cheetahs to the western United States could, in theory, put the pronghorn back onto its natural evolutionary trajectory according to these biologists.
理论物理学家将不得不回到在制图板前，用标准模型寻找其他可以解决问题的方法。
Theoretical physicists will have to go back to the drawing board and find an alternative way to solve the problems with the standard model.
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