英语翻译theory suggests that the maximum sustainable yield that

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英语翻译

theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.Most fisheries are well below that,which is a bad way to do business.

里面的come是什么意思?

优质解答:

就是说“the maximum sustainable yield ”是在“the biomass of a target species is about 50% of its original levels”的时候才可能出现的,这里的come指的是出现,发生的意思.

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