And the phase velocity of fast wave will decrease exponentially with frequency.
快纵波的相速度随频率的增大以指数形式减小。
During fast starting, stopping or running phase, humans often use the impact of their feet on the ground to improve moving velocity.
人类在快速起停或跑动过程中，往往利用脚对地的冲击来提高运行速度。
And the phase velocity of fast wave will decrease exponentially with frequency.
相速度随频率的增大以指数形式减小。
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