木材密度的变化会影响振动，因此也会影响声音。

Variations in wood density affect vibrations, and therefore, sound.

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它振动得越快，发出的声音频率就越高。

The quicker it vibrates, the greater the frequency of sound it produces.

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这些（气泡）会引起振动并损坏涡轮机的叶片。

These can cause vibration and damage the blades of the turbines.

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All the energy that is inserted into this, which might be turbulence initially, becomes heat, or becomes -- it raises the temperature.

由振动引起的所有，进入系统的能量最后都变成了热，因此温度便升高了。

麻省理工公开课 - 热力学与动力学课程节选

Remember these water tanks where you could put a vibrator in a water tank.

想起那些,里面盛有振动器的水槽了吗。

麻省理工公开课 - 固态化学导论课程节选