在有源rfid各种应用中，对于标签运动方向的判断是一个重要的技术问题。
In the various application of active RFID, the judgement of direction of movement is a vital technical matter.
采用这种方法不但可以准确判标签运动方向，而且可以判断标签中途返回等一些复杂逻辑。
In this way, we could not only judge the direction of movement of tags accurately, but also judge other complicated logic, e. g. the midway return of tags.
你应该用篮球运动员来替换你闹里的观点，然后说我们干得不错，你们总是尝试给运动员贴上标签，但是我们不需要标签。
Instead of calling them basketball players and saying they're great at what they do, you try to label players when players don't need labels.
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