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Radar
01
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
例
The geophysics team used ground-penetrating radar to explore subsurface features in the archaeological site.
Radar guns used by law enforcement agencies pulse beams of radio waves to measure the speed of vehicles.
The company quietly launched a new product under the radar to test its reception before a full-scale release.
Highway patrol officers often use radar guns to detect speeding drivers.
It wasn't even on my radar.
