什么水可以浅得让孩童游泳，深得让泳者被淹？

来源: 于 2012-03-30 07:16:26 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

什么水可以浅得让孩童游泳，深得让泳者被淹？(答案明天见）

Which water is shallow enough for children to swim but deep enough for swimmers to drown？