A vibration source and a medium are needed to form a mechanical wave.
机械波的形成需要振源和介质。
Often as in engine bed and mechanical device local lighting and control wiring power source.
常作为机床及机械设备中局部照明及控制线路电源。
Motion and speed are sensed without mechanical couplings, bearings, linkages or an external power source.
运动和速度感到无机械轴承，联系或外部电源。
These mechanical effect of underground water may be associated with source processes of earthquakes.
地下水的这些效应可能与地震震源过程有关。
These mechanical effect of underground water may be associated with source processes of earthquakes.
地下水的这些效应可能与地震震源过程有关。
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