Because it's also useful in studying curves, pi helps us understand periodic or oscillating systems like clocks, electromagnetic waves, and even music.
因为学习曲线也需要用到 π，π 帮助我们认识周期或振动系统，如钟摆、电磁波甚至音乐。
Oscillating system
原声例句
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Oscillation
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Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. The term 'vibration' is precisely used to describe mechanical oscillation but as a synonym of 'oscillation' too. Familiar examples include a swinging pendulum and alternating current power.
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