frequency change

• 频率变化

frequency change的用法和样例：

例句

1. This page will explain how analog signals vary with time and with frequency.
   本单元将解释类比式讯号如何随时间和频率变化。
2. Hysteresis control has disadvantage of unstable switching frequency.
   滞环控制方法存在开关频率变化不定的缺点。