Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
Thanks a lot for having us.
真感谢你邀请我们来。
Beware of a silent dog and still water.
警惕无声之狗会咬人，平静之水会覆舟。
We're ready! she said. Where is everyone?
“我们都准备好了！”她说，“人都到哪儿去了？”