The diaphragm vibrates, thus setting the air around it in motion.
膜片振动，这使得周围的空气也动荡起来。
Air is invisible but we can feel its motion when there is a wind.
空气是看不见的，但有风时，我们能感觉到风的运动。
The motion of the air is constant.
空气的运动是恒定的。
When forward motion is imparted to it from an external source, air is forced.
当由外部能源强迫其向前运动时，空气被迫进入进气道。
The vibration in the air and in the other media travels as a wave motion.
空气及其他介质中的各种振动都是以波动的形式传播的。
To be in a state of motion. Used of the air or of wind.
处于移动的状态。空气或风的移动。
Lily: And little motion in the air Except the mill- wheel's sound.
丽莉：空气凝滞不动除了风车的声响。
The motion of variable mass system under variable force is studied using air track.
在气垫导轨上研究了变质量物体在变力作用下的运动规律。
First, sound is the vibration of air, and it is a kind of wave motion.
首先，声音是空气的振动，是波动的一种。
First, sound is the vibration of air, and it is a kind of wave motion.
首先，声音是空气的振动，是波动的一种。
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