Gerotor
内齿轮油泵
🗣️ 情景例句
Shall I tell him you called?
我告诉他你来过电话，好吗？
He was lucky to have a good home in which to grow up.
他幸运地生长在良好的家庭里。
Often, we help them with the harvest.
我们经常帮助他们收割。