在东面看台那边奔跑的边线裁判。
本发明可以实现足球主裁判与边线裁判的无线联络，简化了信号发射机的复杂度，省去了电池，节省成本。
The wireless contact device realizes the wireless contact between the chief referee and the side referee, simplifies the complexity of the signal transmitter and saves the battery and cost.
2009年9月，赛莲娜 威廉姆斯在参加美国女子网球公开赛时，这个27岁的网坛巨星因对边线裁判暴怒，而引起了一场轩然大波。
Serena Williams sent shock waves through the genteel world of women's tennis in September when the 27-year-old phenom erupted in rage against a U.S. Open line judge.
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