1、
When baby teeth begin to appear, you can clean them with a wet tooth brush toothbrush.
当乳牙开始出现的时候, 你就可以用一个湿牙刷清洁它们了.
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2、
I sit on the chair, sleep on the bed, and use toothbrush to brush my teeth.
我坐在椅子上, 睡在床上, 还有用牙刷来刷牙.
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3、
So young children should be carefully supervised when they brush their teeth.
所以应该注意年幼的孩童当他们刷牙的时候.
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