Communtator
[建] 换向器, 整流器, 整流子
🗣️ 情景例句
Grandpa!
爷爷！
After forty years teaching English he thinks it's time to call it a day.
他教英语四十年，认为该退休了。
The spheres had been magnetized and attracted or repelled each other all the time.
金属球经过磁化，互相之间不停地相互吸引或相互排斥。