Pericycloid
週摆线
🗣️ 情景例句
Every cloud has a silver lining.
再黑暗的地方也有一线光明。
We are sorry to delay the shipment because our manufacturer has met unexpected difficulties.
恕延期货船，因为我们厂家遇到了预料不到的困难。
What did you eat yesterday?
你昨天吃了什么呢？