| 单词 | radar |
| 释义 | radar /ray"dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or perception: lobbyists working under the media's radar. [1940-45, Amer.; ra(dio) d(etecting) a(nd) r(anging)] |
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