I brush my teeth three times a day.
我每天刷三次牙。
Tom thinks it unnecessary to brush teeth three times a day .
汤姆认为一天刷三次牙是没有必要的。
Writing brush has three varieties: rigidity brush, flexible brush and doubled both brush.
毛笔分为硬毫、软毫、兼毫三种。
Writing brush has three varieties: rigidity brush, flexible brush and doubled both brush.
毛笔分为硬毫、软毫、兼毫三种。
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