反弹到空中，所以马上又变成失重状态，来回振动。
So it goes back into the air so it goes immediately to weightlessness again and then it oscillates back and forth.
波会来回振动，而使两列波相遇你会得到一列新的混合波。
Waves oscillate back and forth. Add two waves together and you get a new composite wave.
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。
A vibration, by its nature, is back and forth, a pull and release with bounce back and a return to a pull.
将盆子的底部上下振动，水便会被搅得在棘轮之间来回流动。
The bottom of the dish moved up and down, sloshing the water back and forth through the ratchet.
将盆子的底部上下振动，水便会被搅得在棘轮之间来回流动。
The bottom of the dish moved up and down, sloshing the water back and forth through the ratchet.
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