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1·A radio signal was sent to the spacecraft.

向宇宙飞船发出了无线电信号。《牛津词典》

2·The simple detection of a radio signal will be sufficient to answer this most basic of all questions.

对无线电信号的简单探测就足以回答这个最基本的问题。

3·A spaceship's position can be located by following its radio signal, or by using telescopes and radar.

宇宙飞船的位置可以根据追踪它的无线电信号来确定，也可以用望远镜和雷达来确定。

4·A radio signal has both electrical and magnetic properties.

无线电信号既具有电的特性也具有磁的特性。《柯林斯英汉双解大词典》

5·A radio signal travels very quickly.

无线电信号传播得很快。

6·As we drove into the mountains, the radio signal faded.

当我们驶进山区时，无线电信号渐渐减弱了。

7·This radio signal has a frequency of200,000 cycles per second.

这个无线电信号的频率是每秒200,000周期。

8·And if you put radio telescope there you can get a radio signal.

如果你用射电望远镜的话你就能得到射电信号。

9·So even though the radio signal is a given, you can do a lot with it.

因此，尽管那个无线电讯号是先决的，你对它可以有很多作为。

10·Bloop [ to make the high - pitched sound of interference in a radio signal, ].

[ 在收音机信号里发出高而刺耳的干扰音]。