Variac
[电] 通用无线电公司的可变变压器的注册商名
🗣️ 情景例句
How's everything with you?
你一切如何？
Have you washed any cars?
你洗车吗？
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。