Gerotor
内齿轮油泵
🗣️ 情景例句
I hope Grandpa's going to like living with us.
我希望爷爷喜欢和我们住在一起。
She seldom eats breakfase.
她很少吃早餐。
Suddenly she asked her father why he kept so many old newspapers locked away there,
她突然问父亲为什么把这么多的旧报纸锁在柜子里，