take off 意思是: 起飞;脱下;离开;突然成功 例如: Our flight will take off in an hour .我们的航班一个小时后将起飞。

take down 记下;拿下;拆卸;病倒Why don't you take down the notes in class?课堂上你为什么不记笔记?It's easy to fit together and take down.装在一起和取下来都很容易。