Open mouth breathing is sleeping is the performance of nasal obstruction, facial features should be examined by a doctor to find the causes of obstruction.
张嘴呼吸是睡觉是鼻腔阻塞的表现，应找五官科医生检查阻塞的原因。
He was breathing through his open mouth.
他张着嘴呼吸。
Open them just far enough, just like you are regularly breathing through your mouth.
最长得够大就可以了，能足够你可以用你的嘴呼吸的大小就成。
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