Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
Not too bad. How about yourself?
还可以。你怎么样？
Would you know your daughter, see her in company.
若要知道你女儿，且看她和谁交往。
Which may keep company with the vessel for an hour without visible or more than occasional movement of wing.
它们随船飞行一小时也难得见其扇动一下翅膀。