全美17个城市大约有30家电视台已经在电视转播塔安装了额外的传输仪，传送本地实况节目到移动信号接收器，而且几乎免费。
Some 30 television stations in 17 cities across the country have now installed additional transmitters on their towers to beam live local broadcasts to mobile receivers mostly for nothing.
望远镜接收到的信息将由转播信号的一颗卫星转播到地球上。
A signal-relay satellite would transmit information from the telescope to earth .
这座铁塔用于向偏远山村转播以前他们所不能接收的电视信号。
This metal tower is used to relay television signals to distant villages which were formerly unable to receive them.
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