接力

Each runner passes the baton to the next.

每个赛跑选手都把接力棒传给下个人。

An L-band safety remote control system is introduced which is composed of three stations and one center in order to increase coverage and overcome the limit of earth curvature to intervisibility.

本文介绍种L频段安控系统,它由“中心”组成,用无线接力方法来高覆盖范围并解决地球曲率对通视。