Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
She's always changing jobs.
她老是换工作。
When you go to buy, use your eyes not your ears.
你去购买东西时，要用眼睛莫用耳。
I left at 6:00 so that I could catch the train.
我六点钟出门，以便赶上火车。