n.追踪；追查；描摹；摹图v.描绘( trace的现在分词 )；追溯；发现；跟踪 英英释义： tracing[ 'treisiŋ ]n.the act of drawing a plan or diagram or outlinea drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image同