But if all of them had worked separately and independently without division of labor, they certainly could not have made twenty

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问题 But if all of them had worked separately and independently without division of labor, they certainly could not have made twenty pins in a day and not even one.

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答案但是,如果所有人不分工,只是各自做各自的,一天之内绝不可能生产出20枚钉子,甚至连1枚钉子也生产不出来。

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