radar
radar — 名詞
1. a system that works by sending out high-frequency radio waves and reading their
雷達
利用無線電波探測物體位置與速度的系統
a system that works by sending out high-frequency radio waves and reading their reflected signals, making it possible to locate far-away things like planes, boats, or approaching storms
Hassan spotted a small plane on his radar screen before anyone else did.
Hassan 比任何人都先在雷達螢幕上發現了一架小飛機。
collocation: radar screen
Police set up a radar trap and caught several cars going too fast.
警方設置了雷達測速點，抓到了好幾輛超速行駛的汽車。
collocation: radar trap
Weather radar showed that a heavy storm was moving toward the coast at high speed.
氣象雷達顯示一場強烈風暴正高速朝海岸移動。
collocation: weather radar
The ship's radar system detected another boat about ten kilometers away in the thick fog.
船上的雷達系統在濃霧中偵測到約十公里外的另一艘船。
collocation: radar system
Darius fitted a radar detector to avoid speeding tickets on long road trips.
Darius 裝了雷達偵測器，以免在長途公路旅行時收到超速罰單。
collocation: radar detector
- radar screen
- radar system
- radar detector
- radar gun
- radar trap
- weather radar
- police radar
- on radar
- appear on radar
- track by radar
- radio detection and ranging
the full expanded acronym; highly technical, rarely used in everyday speech
- sonar
uses sound waves instead of radio waves; used underwater rather than through air
- lidar
uses laser light pulses instead of radio waves; used for high-resolution mapping
文法句型
radar + noun (radar screen, radar system)
adjective + radar (weather radar, police radar)
on radar
用法筆記
Radar is most often uncountable — we say 'the plane appeared on radar' not 'on a radar'. When countable, it refers to a specific type or instance: 'The navy installed three new radars on the base.' The noun is frequently used attributively before another noun (radar screen, radar gun, radar signal).
常見錯誤
2. the state of being seen, noticed, or considered by the public or by a particular
關注；注目
被注意或被察覺的狀態
the state of being seen, noticed, or considered by the public or by a particular person or group, used mainly in fixed phrases about receiving or avoiding attention — for example, keeping an activity under the radar to avoid detection, or having an issue come onto a decision-maker's radar
That new restaurant is not on my radar yet, but a friend recommended the pasta there.
那家新的餐廳還不在我的關注範圍內，但有一位朋友推薦了那裡的義大利麵。
idiom: not on [possessive] radar
The small startup stayed under the radar for three years before becoming a well-known brand.
那家新創公司低調經營了三年，後來才成為知名品牌。
idiom: under the radar
After the scandal, the CEO's every move was on the radar of reporters.
醜聞爆發後，那位執行長的每個舉動都在記者的關注範圍內。
idiom: on the radar of
Romi's research on plastic pollution finally came onto the radar of the government last year.
Romi 關於塑膠污染的研究終於在去年進入了政府的關注焦點。
collocation: come onto the radar
The old project was quietly cancelled and soon fell off everyone's radar.
那個舊專案被悄悄取消，不久後就沒人再關注了。
collocation: fall off the radar
- on my radar
- on the radar of
- under the radar
- off the radar
- fall off the radar
- come onto the radar
- stay under the radar
- not on the radar
- obscurity
the state of being unknown or unnoticed; more formal and less vivid than the radar metaphor
文法句型
on [possessive] radar
under the radar
off [possessive] radar
come onto [possessive] radar
用法筆記
This is an extended metaphorical sense of the original radar meaning. The phrase 'under the radar' generally has a positive or neutral connotation when describing clever avoidance; 'on someone's radar' can be neutral or slightly urgent. 'Off the radar' is typically neutral, describing something simply not receiving attention. Unlike sense 1, this sense cannot be used with a countable form or in technical compound nouns.
常見錯誤
on someone's radar
idiombeing noticed, considered, or thought about by a particular person or group
在某人的關注範圍內；受到某人注意
Lan put studying abroad on her radar after talking to a friend who studied in Canada.
The issue of plastic waste was not on the government's radar until the protests began.
under the radar
idiomhappening or existing without being noticed by the public or by those in charge
不引人注目；低調地；暗中進行
The band released four albums under the radar before finally becoming famous.
Shanti managed to slip under the radar during the meeting so nobody asked her any questions.
no longer being noticed, considered, or remembered by a person or group
不再受到關注；被淡忘
After she left the company, she completely fell off everyone's radar in the industry.
Eitan's idea was interesting at first but quickly fell off the radar when the budget was cut.
This means that something is not noticed or known by most people.
不為人知
Maya's small business stayed under the radar for years.
Did the error slip below the radar during the review?
This means that something is either receiving attention or not being noticed anymore.
受到關注/被忽略
Climate change is back on the radar after the summit.
The old scandal has completely fallen off the radar screen.
同根字
- radar detector名詞B2
- radar gun名詞B2
常見搭配
副詞搭配
- on — appear on radar, show up on radar
- under — stay under the radar, fly under the radar
常用片語
- radar screen
- radar system
- radar detector
- radar gun
- radar trap
- radar signal
- radar image
介系詞搭配
- by — track by radar, detect by radar
- on — on radar, on the radar screen