婴儿长牙时口水顺着下巴流下来。

The baby had drool running down his chin while teething.

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The baby had drool running down his chin while teething.

drool 是名词,意思是"口水、唾液",指从嘴里流出的液体。这个词也可以作动词用,表示"流口水"。

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