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。
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.