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
Shall I call Mr. Marchetta for you?
要我替你打电话给 Marchetta先生吗？
Would you answer the phone please?
你能接下电话吗？
How long has Kate been at her school?
凯特进校学习有多长时间了？