Flews and gums are black or SLATE gray.
上唇和牙龈为黑色或暗蓝灰色。
The flews of the upper jaw are strongly developed and overlap the lower jaw to give a square look when viewed from the side.
从侧面观察的时候，上唇和上颚非常发达，与下颚交叠，形成矩形外观。
The flews of the upper jaw are strongly developed and overlap the lower jaw to give a square look when viewed from the side.
从侧面观察的时候，上唇和上颚非常发达，与下颚交叠，形成矩形外观。
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