The group velocity(U) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。
The group velocity(U) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。
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