角速度（以度/秒为单位）。
与 3D 刚体不同，Rigidbody2D 只能绕一个轴（垂直于平面）旋转，因此角速度只是一个浮点值，而不是一个矢量。通常情况下，该属性的值不是直接设置的，而是通过向刚体施加 torques 间接赋值的。在角阻力 的作用下，角速度会自动减慢。
See Also: velocity, AddTorque, AddForceAtPosition, angularDrag.
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