"Frequency" just means the rate at which air molecules go back and forth, or a voltage fluctuates, and it can be represented as the rate at which a regular squiggle goes up and down.
频率“通常是指空气粒子来回运动的速率或者电压的波动，所以它能代表一个规则波形曲线上下波动的节律。”
2
Each time she moved up in vibration, the weekend with her son would cause her to roll back in frequency and become ill.
每次她提高振动，但到周末和她儿子呆一起时就导致她频率回跌而生病。
3
An Earth station beams a signal up to the satellite at a certain frequency, and the craft bounces it back down to another, predefined Earth station.