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TOEFL IELTS BNC: 7112 COCA: 4780

radar

noun
 
/ˈreɪdɑː(r)/
/ˈreɪdɑːr/
[uncountable]Idioms
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  1. a system that uses radio waves to find the position and movement of objects, for example planes and ships, when they cannot be seen雷达
    • They located the ship by radar.他们通过雷达确定了船只的位置。
    • a radar screen雷达显示屏
    compare sonar
    Extra Examples
    • The aircraft suddenly went off the radar.飞机突然从雷达显示屏上消失了。
    • The submarine is impossible to detect on radar.雷达不可能探测到这种潜艇。
    • navigation by radar通过雷达导航
    Topics Transport by waterc1, Transport by airc1
    Oxford Collocations Dictionaryadjective
    • enemy
    • police
    • airborne
    • …
    verb + radar
    • be equipped with
    radar + noun
    • operator
    • station
    • system
    • …
    preposition
    • by radar
    • on radar
    phrases
    • off the radar
    • on the radar
    See full entry
    Word Origin1940s: from ra(dio) d(etection) a(nd) r(anging).
Idioms
below/under the radar
  1. used to say that people are not aware of something在视线以外的；未引起注意的
    • Experts say a lot of corporate crime stays under the radar.专家说许多公司犯罪还没有为人所注意到。
    • The conflict has slipped below the radar of the mass media.这场冲突已被大众媒体忽视。
on/off the radar (screen)
  1. used to say that people’s attention is on or not on something受／不受人关注
    • The issue of terrorism is back on the radar screen.恐怖主义问题重新受人关注。
    • Since the scandal broke, all other issues seem to have disappeared off the radar screen as far as the media is concerned.自丑闻爆发以来，就媒体而言，所有其他问题似乎都已从雷达屏幕上消失。

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