这种往返运动使听筒前的空气以同样的方式做往返运动。
This back-and-forth movement of the disc causes air in front of the receiver to move back and forth in the same way.
新式双锥型研磨腔体设计，可使研磨珠自动往返运动，确保研磨珠分布更均匀。
New double conical grinding chamber design, make grinding beads in the conical chamber flow in a linear way, enable distribution to be more uniform.
本装置不用任何 外部件对气缸进行换向，就能达到高速往返运动，能使物体快速移动。
No external part is required by the device for reversing the cylinder, and the high-speed back-and-forth motion can be achieved, so that an object can move fast.
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