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v.描绘( trace的过去式和过去分词 );追溯;发现;跟踪 双语释义:n.(名词)[U] [C]痕迹,踪迹 mark or sign that shows sb/sth happened or existed[U]些许,微量 very small amount of sthv.(动词)vt. 追踪; 追溯 track; follow or discover sb/sth by observing marks, tracks, bits of evidence, etc.vt. 发现; 找到 disco