Each particle's velocity is set to the emitter's current velocity value, every frame.
每一帧，每个粒子的速度都设定为发射器的当前速度值。
Each particle inherits the emitter's velocity on the frame when it was initially emitted.
每个粒子在最初发射时都继承了发射体在帧上的速度。
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How to apply emitter velocity to particles.
如何将发射体速度应用于粒子。