used to: 过去常常
He used to go shopping every morning.
他以前每天上午都去商店买东西。

once upon a time: 很久以前
Once upon a time, there lived an old man who had two beautiful daughters.
从前， 有一个老人， 他有两个美丽的女儿。

fly off: 飞走、飞离
The car crashed when the wheel flew off.
一只轮胎飞脱而出，汽车就撞坏了。

warm up: 预热、热身
The players are warming up before the game.
运动员们正在做赛前的热身活动。

throw over: 抛弃、遗弃
Don't throw over an old friend.
不要背弃老朋友。