Box2D可用接头连接不同的形状，甚至可以包括关节马达和滑轮。
Box2D can join shapes with joints and even includes joint motors and pulleys.
滑动接头：马克斜滑的女性在照片显示关节角落。
Slip joints: Mark beveled the corners of the female slip joints as shown in the photo.
这是一个逐渐退化软骨关节(接头)由于折磨人的。
This is a gradual degeneration of articular (joint) cartilage due to wear-and-tear.
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