The issue of terrorism is back on the radar screen.

恐怖主义问题重新受人关注。

《牛津词典》

No matter where the radar signal hits the plane, some of the signal gets reflected back.

雷达信号接触到飞机的任何部位，都会有部分被反射回来。

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And he couldn't even say what kind of curious radar or homing device had brought him back to the Grand Concourse in his Lincoln Town Car.

他也搞不懂究竟是什么样的雷达或者指引回家路线的装置引领着他，他开着他的林肯城市车回到了大广场街。

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The Patriot missile homes on an electronic signal "painted" on the target by the radar, and relays its position in relation to the target back to the radar and on to the control centre.

BBC: Fact file: Patriot missile defence

It's possible that some of these medicines may eventually claw their way back onto our radar screen.

FORBES: The Failures

But 1549 flickered back onto his radar screen, suggesting the plane had regained use of one of its engines.

CNN: Controller thought Hudson landing would be 'death sentence'