Underfrequency
降低了的频率, 最低的频率, 低于额定频率
🗣️ 情景例句
It was so exciting to meet her again after so many years.
多年以后和她再相遇是多么让人激动啊!
He studied quite a lot.
他非常用功。
Sure! When do you want it?
当然可以！您什么时候要？