Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
What are you doing this weekend?
你本周末打算干什么？
His watch may be more expensive but mine tells the time better!
他的手表可能更贵些，但是我的表的时间要准确些。
With a stopwatch, they counted how many times the bees repeated the dance during one minute.
他们用秒表记录蜜蜂在一分钟内重复舞蹈的次数。