Expansion of the lower jaw involves uprighting tipped lower teeth, since there is no lower suture to open.

比较低的颚扩充包括直立的装顶端了比较低的牙齿，自没有比较低的缝合打开以后。

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Expansion of the lower jaw involves uprighting tipped lower teeth, since there is no lower suture to open.

比较低的颚扩充包括直立的装顶端了比较低的牙齿，自没有比较低的缝合打开以后。

youdao