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假设你被蒙住眼睛,站到一个桌子面前,有一个水桶放在桌子上,然后问你桶里是空的还是盛满水。有三种方法,无需你揭开蒙眼的纱布就可以获悉答案。
Suppose you are blindfolded, standing in front of a table, having a bucket on the table and asking you if the bucket is empty or filled with water. There are three ways to learn the answer without opening your blind gauze.