Now, mechanical waves need a medium to travel through.
现在，机械波需要介质才能传播。
Mechanical wave
原声例句
可汗学院Khan Academy Middle school physics - NGSS初中物理
可汗学院Khan Academy Middle school physics - NGSS初中物理
Now, everything that we have just talked about, these are called mechanical waves.
现在，我们刚才谈到的一切都被称为机械波。
中文百科
机械波
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机械波（Mechanical wave）是机械振动在空间中的传播，是波的一种。机械波的特点是必须通过介质来传播。另外有一些波，比如电磁波，引力波，不通过介质，而是在真空中传播（严格的讲，是通过场来传播），它们不是机械波。
- 机械波的例子：
- 绳波
- 水波
- 声波
- 波的种类：
- 横波 (Transverse wave)
- 纵波 (Longitudinal wave)
- 面波 (Surface wave)
英语百科
Mechanical wave 机械波
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, oscillating material does not move far from its initial equilibrium position. Mechanical waves transport energy. This energy propagates in the same direction as the wave. Any kind of wave (mechanical or electromagnetic) has a certain energy. Mechanical waves can be produced only in media which possess elasticity and inertia.
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