radar (雷達)

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radar: 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 that are reflected off the object back to the source. (雷達：透過發出高頻電磁波脈衝，這些脈衝被物體反射回源頭，從而檢測出飛機、船舶和其他物體的存在、方向、距離和速度的系統。)

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