An Earth station beams a signal up to the satellite at a certain frequency, and the craft bounces it back down to another, predefined Earth station.

地面基站先用特定频率向卫星发送数据，然后卫星再将把这些数据转发给其它预先确定的地面基站。

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Americans use another expression that means almost the same as "down-to-earth. " The expression is "both-feet-on-the-ground.

美国人还有另外一个词，含义跟“讲究实际”几乎一样，那就是“脚踏实地”。

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Americans use another expression that is similar in some ways to down to earth.

VOA: special.2009.03.08

They certainly seem to be on the crest of another wave though resolutely down-to-earth about their own celebrity.

BBC: Human League reveal Secrets