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因为当人们俯卧的时候，下颚会比平时更加突出。
When people sleep on their front, their lower jaw is positioned further forward than normal.
youdao
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过度的上颚突出式咬合或下颚突出式咬合都属于缺陷。
The badly undershot or overshot bite is a serious fault.
youdao
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过度的上颚突出式咬合或下颚突出式咬合都属于缺陷。
The badly undershot or overshot bite is a serious fault.
youdao