as for television signals
至于电视信号
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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