radar

radar
noun
  1. [mass noun]a system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves which are reflected off the object back to the source
    雷达,无线电探测系统
    ■[count noun]an apparatus used for this
    雷达设备,无线电探测器
    ■a person's capacity for intuitive perception; a special sensitivity for factors, trends, etc
    (人的)直觉感知能力;(对因素或潮流等的)敏感性
    keep your radar tuned to changes at work.
    你要留意工作中的变化。
语源
  1. 1940s: from ra(dio) d(etection) a(nd) r(anging)
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