... mouth ==> 排出口,河口,收口部分,口 mouth acidity ==> 口酸度 mouth blowing ==> 人工吹制 ...
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However, they also increase mouth acidity which erodes dental enamel - the tooth's hard protective coating.
但是，这同样会由于增加了口腔酸性而腐蚀牙齿的保护膜，牙釉质。
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