Fluctuating voltage
[电] 增减起伏电压
🧩 词语组成解析
v. 波动（fluctuate的ing形式）
🗣️ 情景例句
How long have you known her?
你认识她多久了？
Have you ever thought about becoming a professional musician?
你曾经想过要成为职业音乐家吗？
I'm off on Sunday.
星期天动身。