Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
He should just about get by in the exam.
他这次考试还能勉强及格。
Sorry, She is out. Shall I take a message?
抱歉，她外出了，你要留口信吗？
The man said that the pen was worth $50,
那人说那支笔值50英镑，