radar screen

基本解释

In fact, that has happened, although it has appeared to have "slipped under the radar screen" of most developers.
事实上，这种情况已经发生了，尽管它看起来好像从大多数开发人员的雷达屏上消失了。
They're in remote, isolated places, some even risking their lives, with no chance of getting on the international radar screen.
他们身处在国际雷达网上都找不到的遥远偏僻之地，有些人甚至冒着生命危险。
It may also explain why few Europeans appreciate quite how much movement up and down the income ladder there is, because much of it takes place off the radar screen of the politically influential.
同时这也部分的解释为什么很少有欧洲人知道上下的收入阶梯有多大，因为其中大部分都发生在政治影响的雷达屏幕之外。

Think about the advent of hedge funds -twenty or twenty-five years ago, hedge funds were a blip on the radar screen.
想想对冲基金刚出现时,差不多20或25年前,它就像雷达屏幕上的一个小点
耶鲁公开课 - 金融市场课程节选

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