Conversion efficiency
[电] 变换因数
🧩 词语组成解析
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
Did you go to the movies last night?
你昨晚去看电影了吗？
Certainly! I'm coming now, Mum!
当然可以，妈妈，我马上就来。