Altemating megnetic flux
[电] 交变磁场
🧩 词语组成解析
🗣️ 情景例句
About forty minutes, I think.
我想大约40分钟。
How long is the ride?
要坐多久？
I looked at my watch.It was true.
我看了一下我的手表，果真如此。