以下为句子列表：
英文: 8 As a satellite passes overhead, it sends out a radio signal that can be detected by a receiver in a car's computer.
中文: 卫星从高空经过时发出能被汽车上计算机里的接收器辨认的无线电信号。
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英文: A radio signal tells the pilot of an airplane when his plane is off the beam.
中文: 飞机脱离航道时，会有一个无线电信号告诉驾驶员。
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英文: A radio signal travels very quickly.
中文: 无线电信号传播得很快。
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英文: As the first stars flickered on, their ultraviolet light excited neutral hydrogen atoms around them, causing the gas to emit a faint radio signal at 1,420 megahertz.
中文: 当第一批诞生的恒星开始闪烁，它们发出的紫外光会激发周围的中性氢原子，使这些气体发出频率为1420百万赫兹的微弱电波讯号。
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英文: But when poachers carrying rifles or machetes traipse by a detector, it will send a radio signal to a treetop antenna.
中文: 而当偷猎者携带步枪或弯刀行走到探测器附近的时候，探测器就会发送一个无线电讯号到树顶的天线上。
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