Some scientists are puzzled as to why no messages have been sent back even though humans have been transmitting radio and television signals for the last century.
一些科学家感到很困惑，为什么即使人类已经在上个世纪就发出了广播和电视信号，却没有任何回音。
Satellite will be in before the Beijing Olympic Games begin transmitting digital television signal, when tens of millions of families will be directly to watch the Olympics.
卫星将于北京奥运会前开始传输数字电视信号，届时数千万家庭将可直接收看奥运会盛况。
The invention discloses a remote control transmitting device for a television and a control method.
本发明公开了一种电视遥控发射装置及控制方法。
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