radar
/ˈreɪdɑ:(r); `redɑr/ n[U]
(a) system for detecting the presence, position or movement of solid objects within its range by sending out short radio waves which they reflect 雷达
locate an aircraft by radar 用雷达测定一飞机的位置.
(b) equipment used for this 雷达装置
Enemy ships were detected on the radar (screen). 敌舰的影像已显现在雷达（屏幕）上.
[attrib 作定语]
a radar operator, installation, scanner 雷达手、 设备、 扫描天线. Cf 参看 sonar.