近些年来，很多通讯卫星被送上轨道。
In recent years a number of communications satellites have been put into orbit.
航天飞机能把远高于现在使用的火箭的载荷送上轨道，并且可以把重物件运返地面。
The shuttles can carry a far greater load into orbit than any other rockets now in use, and can also bring heavy items back to the ground.
为了能通过卫星传送像奥运会这样的比赛项目，电视信号要先转换成无线电波，然后从某个地面发射站把无线电波送上轨道卫星。
In order to transmit an event such as the Olympics via satellite, television signals are first changed into radio waves, which are then sent from a station on earth to a orbiting satellite.
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