Each ring road of Beijing is a rough division of social class.
北京的每一条环线都是一个阶层的粗略划分。
Class or division and the subsidiary risk;
类别或者项别以及次要危险性；
Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies.
结论：安氏II类2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。
Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies.
结论：安氏II类2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。
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