Underfrequency
降低了的频率, 最低的频率, 低于额定频率
🗣️ 情景例句
She's enthusiastic about the new teaching method.
她对新的教学方法很热心。
Why are you crying?
你为什么哭？
Winter is a cold season.
冬天是一个，寒冷的季节。