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妈妈让我注意，刷牙要刷3分钟。可是不知道3分钟究竟是多长时间，我经常简单刷一刷完事了，总不可能为了刷牙，不断地出入卧室去看表吧?
Mother let me note, brush your teeth to brush 3 minutes. But do not know exactly how long 3 minutes, I often brush a brush finished, it is impossible to brush your teeth, constantly out of the bedroom to watch it?