问题描述：
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?
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?
问题解答：
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