Underfrequency
降低了的频率, 最低的频率, 低于额定频率
🗣️ 情景例句
Are you making progress?
你有进展吗？
Kinsman helps kinsman,but woe to him that hath nothing.
亲人帮亲人，无亲来帮愁煞人。
Though he managed to take a number of brilliant photographs, he could not stay near the volcano for very long.
尽管他设法拍了一些十分精彩的照片，但他却不能在火山附近停留太长的时间。