... potential security threats 潜在保安威胁 radio and communication system 无线电 通讯系统 ramp 船首吊门 ...
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In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.
在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。
However, this purely visual system was useless in bad weather, and, by the 1930s, radio communication was coming into use for ATC.
然而，这种纯粹的视觉系统在恶劣天气下毫无用处，到了20世纪30年代，无线电通信开始用于空中交通管制。
The SWR is a developing trend of the third generation mobile communication system and military radio.
软件无线电(SWR)技术是第三代移动通信系统和军用电台的发展趋势。
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