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.

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。

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The space shuttle Atlantis is on its way back to earth from the International space Station on its last voyage after a 25-year career.

经过25年的职业生涯之后，亚特兰蒂斯后航天飞机正在从国际空间站返回地球，这是其最后一次航行。

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That could happen about five years from now, perhaps using a laser on the International Space Station to transmit solar power collected by its panels to Earth.

从现在算起，实验可能会在未来的五年内进行，可能采用的方法是利用国际空间站的激光将太阳板收集到的太阳能传送到地球。

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All four Cluster satellites will fly independently, controlled by radio contact with a ground station on earth, rather than talking among themselves about where they are.

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He'll then spend over a week orbiting Earth on the space station.

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He had it easy: His mission was always pretty clear: Save the earth from a space-station-based lunatic bent on replacing humanity with supermodels, and so on.

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