"electronic system for locating objects by means of radio waves," 1941, acronym (more or less) from radio detecting and ranging. The U.S. choice, it won out over British radiolocation. Figurative from 1950.
实用例句
1. It was yet another case where the human eye outperformed radar.
这是肉眼胜过雷达的又一事例。
来自柯林斯例句
2. The plane is used for electronic jamming and radar detection.
这架飞机用于进行电子干扰和雷达探测。
来自柯林斯例句
3. The US crew fixed its radar on the Turkish ship.