Nfb
负反馈
🗣️ 情景例句
The more natural it will become.
它们就会变得越自然。
Which train do I take to Philadelphia?
去费城乘哪趟车？
Oh, very well. Then there is nothing to worry about. I apologize. (Hands him the note.)
哦，那太好了，没什么可犯愁的了。我向你道歉。（把钞票递给他）