它的叶子是粗糙和有锯齿的，分为7至9个叶片。
The leaves are coarse and toothed, divided into 7 to 9 leaflets.
正确的关键有锯齿的提高金属片上面的槽正确的高度，使螺栓下滑。
The proper key has serrations that raise the metal pieces to the correct height above the slot, allowing the bolt to slide.
在中间滑道的底部布置有锯齿空间。
A jook space is arranged at the bottom of the middle slide-way.
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