percussion wave 冲击波
A percussion device (7) gives impact pulses to a waveguide (21), where a compression stress wave and a reflected tensile stress wave are generated, which propagate in the waveguide.
冲击设备(7)向波导(21)提供撞击脉冲，在波导中产生压缩应力波和反射的拉伸应力波，应力波在波导中传播。
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