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趣题:有两个计时沙漏,一个是12分钟的沙漏,另一个是16分钟的沙漏,使用这两个沙漏,怎样测出20分钟的时间呢?
There are two hourglass hourglass, one is the hourglass 12 minutes, the other is the hourglass 16 minutes, the use of these two hourglasses, how to detect 20 minutes of time?