It is not speed, but variations in speed that cause density waves.
并不是速度高低引起了拥堵波，而是速度的不一致性。
Actually photoelectron density is the function of electron speed.
事实上光电子数密度是光电子速度的函数。
The main requests of the In-Wheel-Motor are small size, high speed and high power density.
轮毂电机要求体积小、转速高、功率密度高。
The main requests of the In-Wheel-Motor are small size, high speed and high power density.
轮毂电机要求体积小、转速高、功率密度高。
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