基底的前端称为墙趾；

Basis front end is called the wall foot;

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所述辅撑臂的两侧各往上延伸一斜状凸墙，所述斜状凸墙的前端段侧面各贯设一墙孔，而前段顶面各设置一撞击凸块；

The bilateral slot walls of the shrinking bunch are respectively provided with a wall hole and an inclined salient wall is extended from the both sides of the subsidiary arm brace.

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