被动雷达的一个难题在于它要依靠第三方提供的信号。
The continued availability of transmissions is considered to be part of Britain s criticalnational infrastructure, says John Smith, the project leader for Thales.
泰利斯工程组的项目带头人约翰?史密斯说,广播电视业被认为是英国关键的国家基础设施。
Nevertheless, he adds, the study will look at how agreements can be made with broadcastersto ensure reliability and performance, and how to deal with routine maintenance whenTV transmission towers are turned off.
不过他补充道,研究将着眼于如何跟广播公司达成协议,以及如何在电视信号发射中断时进行例行维护。
Air-traffic controllers and pilots would not take kindly to being confronted with theequivalent of a TV test card.
空中交通管制员和飞行员可不会乐意接受电视测试卡的等价物。
词语解释
1.keep an eye on 照看; 照管; 留心; 注意
Can you keep an eye on things for the next fewdays?
以后的几天,你可以帮我照看一下吗?
Smart homes could keep an eye on elderly peopleand allow them to be more independent.
智能型家庭可以照看老年人,并且让他们更加的独立一些。
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