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Meanings of explosive trace detection in English

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.

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        Usage of explosive trace detection in English
        1
        In 2008, DHS also contracted with L3 Communications to provide two of its its PassPort explosives trace -detection systems for testing at Los Angeles International Airport.
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