Gerotor
内齿轮油泵
🗣️ 情景例句
You got it.
答对了。
A bargain is a bargain.
达成的协议不可撕毁。
It is not a simple competition for a fixed amount of food determined by the physical environment,
它已不是为了争得物质环境所决定的有限食物而进行的简单竞争了，