abbr. Automatic Target Tracking System 
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ephemerid, ephemeris, ephemeris time, ephemeroid, ephemeron, ephemerophyte, ephemerous, ephemerus, Ephesian, Ephesians,
相似单词
attrited, attrition, attrition rate, attritor, attritus, ATTS, ATTU, Attucks, attune, attune to,