Engineers monitoring the bridge would just need to scan them with radio waves to see which wavelength they responded to, in order to find out what was going on.
工程师监测桥梁只需用无线电波扫描天线，来观察他们的反馈波形，就可以得出桥的安全状况。
2
Unlike previously existing radio telescopes, which scan the sky for limited periods, the Allen telescope Array probed the universe round the clock.
不像在它之前的射电望远镜，只能在有限的周期内扫描天空，艾伦望远镜阵列可以昼夜不停地探测宇宙。
3
This paper states the traits of FH communication, and discusses the paradox of the digital strip scan technique that can analyze the reconnaissance probability of the shipboard FH radio.