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to quickly run away
飞奔逃走
This expression alludes to the fact that the heels are all one sees of a fugitive running away fast.
这个表达暗示了这样一个事实:一个逃亡者在快速逃跑时，所能看到的只有脚后跟。
When they saw the soldiers coming, they took to their heels. 当看见士兵过来时，他们拔腿就跑。
He took to his heels and rushed out of the room.
他一溜烟跑出了房间。