A.System.ObjectB.UnityEngine.ObjectC.UnityEngine.GameObjectD.UnityEngine.Compoenent
A.SpeedB.AccelerationC.AngularSpeedD.StopingDistance
A.M层是侦听者,V层是派发者B.C层是侦听者,V层是派发者C.V层是侦听者,M层是派发者D.M层是侦听者,C层是派发者