Peritrochoid
外摆线圆
🗣️ 情景例句
This is Susan with Jiaotong University student. May I have your name, sir?
我是交通大学的在校生苏珊，请问您贵姓？
Could I have the bill, please?
请把帐单给我好吗？
Uncle Wang, may I ask you some questions, please?
王大叔，我可以问你一些问题吗？