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CET-4 CET-6 考研 TOEFL IELTS BNC: 7112 COCA: 4780
radar
ra·dar / 5redBr ; 5reIdB: /noun C,U
1. a piece of equipment that uses radio waves to find the position of things and watch their movement雷达;
sonar:
The coastline can now be monitored by radar.现在海岸线能用雷达监测。
We could see the plane quite clearly on the radar screen.在雷达屏幕上可清晰地看见飞机。

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