All sound is created when molecules in the air, water, or any other medium vibrate in a pulsing wave.
当空气、水或任何其他介质中的分子以脉冲波振动时，所有声音都会产生。
Pulse wave
原声例句
TED-Ed（视频版）
精选英语短文
The team will collect blood, urine, saliva, feces and other samples, measure blood pressure, and monitor the pulse wave velocity of the volunteers, including Zhu himself, to provide samples for follow-up research.
团队将采集包括朱本人在内的志愿者的血液、 尿液、 唾液、粪便等样本， 测量血压，监测脉搏波速度，为后续研究提供样本。
英语百科
Pulse wave
A pulse wave or pulse train is a kind of non-sinusoidal waveform that is similar to a square wave, but does not have the symmetrical shape associated with a perfect square wave. It is a term common to synthesizer programming, and is a typical waveform available on many synthesizers. The exact shape of the wave is determined by the duty cycle of the oscillator. In many synthesizers, the duty cycle can be modulated (sometimes called pulse-width modulation) for a more dynamic timbre. The pulse wave is also known as the rectangular wave, the periodic version of the rectangular function.
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