Gerotor
内齿轮油泵
🗣️ 情景例句
I've got extra time on my hands.
我有过多空闲时间。
Whom will you race with?
你将和谁比赛？
You can print the telephone number of your information service in the newspaper.
你可以把你的问讯服务的电话号码登在报纸上。