背快是排球运动快球的一种。是指扣球队员在二传手背后，扣二传手背传的近体快球。由于二传手看不到扣球队员的动作，因此需要协同默契配合。
在她跑得时候，还踩到了我哥哥的背，以至于第二天早上，我哥哥一直不停的抱怨说自己的后背快疼死了。
While running she trampled over my brother's back. The next morning my brother kept complaining how his back was killing him.
在她跑得时候，还踩到了我哥哥的背，以至于第二天早上，我哥哥一直不停的抱怨说自己的后背快疼死了。
While running she trampled over my brother's back.The next morning my brother kept complaining how his back was killing him.
这天好长啊，她的背都是紧绷绷的，但她还是很高兴这么快就逛完了商店。
The day had been long and her back was tense, but she was pleased she had finished shopping so quickly.
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