Gerotor
内齿轮油泵
🗣️ 情景例句
May I use a knife and fork please?
我可以用刀叉吗？
The fear of ill exceeds the ills we fear.
杞人忧天，庸人自扰。
The lines of the animal had in fact been cut into the rock.
事实上，动物的线条被刻进岩石里。