Yfs
(yf 的第三人称 -s形式) abbr. 黄热病（Yellow Fever）
🗣️ 情景例句
Go by the book.
照章办事。
He said he would rather not tell his age.
他说他不愿告诉年龄。
That's all right. Thank you. Goodbye!
好的。谢谢你，再见！