1、It is far from simply a radio beam passing through a vacuum at "the speed of light".
這遠(yuǎn)不像一束無線電波“以光速”穿過真空層那樣簡單。

2、Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.
無線電射束也象探照燈的光束一樣，是不能高度集中的；它總要散開。

3、Following a radio beam Used of aircraft
跟隨無線電波。用于指飛機(jī)

radio beam翻譯