Box2D is a simple physics engine with a broad use.

Box2D是一个简单却用途广泛的物理引擎。

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Box2D is defined as a rich API that provides a variety of services.

Box2D可被定义为一个能提供多种服务的富api。

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Box2D can join shapes with joints and even includes joint motors and pulleys.

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。

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The physics are apparently a modified version of Box2D, which I personally have experience with and am embarrassed looking back at my own attempts to work with it after playing Intrusion 2, as I had not ever seen a game use physics like this while managing to still look fairly natural.

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