When police arrived, the thieves had already takentotheirheels.
当警察赶到时，小偷们已经逃之夭夭了。
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A team of scientists from University of Freiburg in Germany are developing a shoe with a sensor to automatically tie its laces that could be taken off when users click theirheels together.
德国弗莱堡大学（University of Freiburg）的一个科学团队正在研究一种可利用传感器自动系鞋带的鞋，当使用者碰撞鞋跟时，鞋带就能自动解开。