radar
/ˈreɪdɑː(r)/noun
mass noun
1- a system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves which are reflected off the object back to the source雷达, 无线电探测系统。
1.1
- count noun an apparatus used for this雷达设备, 无线电探测器。
1.2
- a person's capacity for intuitive perception; a special sensitivity for factors, trends, etc.（人的）直觉感知能力; （对因素或潮流等的）敏感性：
keep your radar tuned to changes at work.
你要留意工作中的变化。
词源
1940s: from ra（dio） d（etection） a（nd） r（anging）.