Rackwork
齿条, 齿条加工, 齿条机构
🗣️ 情景例句
I'm worried about you and Mom.
我很担心你和妈妈。
When you called me, I was eating dinner.
当你打电话给了我时，我正在吃晚饭。
Good morning. Can I help you?
早上好！我能帮您什么忙吗？