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閿欒: Unknown column 'ask_classid' in 'where clause'
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上颌前突多表现为开唇露齿,自然状态下双唇不能并拢,微笑时牙龈外露过多。多由先天因素所致,主要与基因遗传或胎儿在母体内环境的影响所引起。