英语语法分析

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。