不需要卫星、无线电发射塔、播音室。

No satellites, radio towers or studios needed.

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在网络图中添加无线电发射塔或类似的广播设备。

Adds a radio tower or similar broadcasting device to your network diagram.

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比如：你也许注意到岸上的无线电发射塔和你的比赛目标在一条直线上，那么比赛中你就可以用这个发射塔作为参照。

For example, you might notice that a radio tower is in line with the buoy you're aiming for, and you can use that tower as a reference point during the race.

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