英语脑筋急转弯,you are standing at a well with two pots.One holds s

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英语脑筋急转弯,
you are standing at a well with two pots.One holds seven litres and the other holds five litres.Neither pot has any markings so the only amount of water you can measure accurately is when a pot is full.How can you measure out exactly four litres?

翻译：
你站在井的两盆.其他拥有五公升和一个七公升.既不锅有任何标记,因此,只有水你可以准确测量量满一壶时.你怎么可以衡量出确切地四公升?回答;
你可以先将7升的壶灌满,倒5升至5升的壶,将5升壶倒空,再将剩余的2升倒入5升壶；
再将7升壶灌满,此时5升壶中有2升水,所以就只能倒3升入5升壶,此时7升壶中也就只剩4升水.

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