... bat back and forth 详细考虑 Back and Forth vibration 前后抖动 rocking back and forth 不停地前后摇晃 ...
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back and forth vibration
前后振动
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A vibration, by its nature, is back and forth, a pull and release with bounce back and a return to a pull.
振动的本质就是来来回回，牵拉再释放使其反弹再牵拉的过程。
youdao
Sound is caused by vibrations. A vibration is a back and forth movement.
声音是由振动引起的。振动就是往复运动。
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