a system for screening luggage in airports; an agent passes a swab around or inside luggage and then runs the swab through a machine that can detect trace amounts of explosives
同义词:explosive trace detection
ETD详细解释
ETD 或 e.t.d. abbr.(略语) Estimated time of departure. 估计离开时间:估计出发的时间(预计离开的时间)