| 单词 | radar |
| 释义 | radar (once / 1430 pages) n Radar is a system for locating objects by bouncing radio waves off of them. Air traffic controllers use radar to keep track of exactly where airplanes are. Radar is a scientific method of figuring out where objects are — it's used today by the Coast Guard, astronomers, and the military, among others. Researchers in the late 1800's and early 1900's realized that radio waves could be reflected off solid objects, and by World War II radar was frequently used to detect ships and planes. The name radar is a shortened form of the phrase "radio detecting and ranging." WORD FAMILYradar: radars USAGE EXAMPLESLike driverless cars, the delivery robots use cameras, GPS devices and radar to navigate the urban environment. Washington Post(Dec 30, 2016) The search began Friday evening when the Coast Guard received a call that the Cessna disappeared from radar while en route to Molokai from Honolulu. Seattle Times(Jan 02, 2017) Coercive control is, thankfully, now on the radar. The Guardian(Jan 02, 2017) n measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects Syn|Hypo|Hyper microwave radar, radio detection and ranging, radiolocation Doppler radar radar that uses the Doppler shift to measure velocity early warning radara radar that is part of an early warning system 3d radar, three-dimensional radarradar that will report altitude as well as azimuth and distance of a target weather radarradar that is able to detect clouds and precipitation measuring device, measuring instrument, measuring system instrument that shows the extent or amount or quantity or degree of something |
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