Trace Nb微量铌tracen.痕迹；微量；踪迹v.追踪；描绘；找出根源traced through the files.顺着小径穿过田野trace enrichment technology痕量富集技术traced cloth for embroidery刺绣用描绘布trace length of joint plane节理面延展性Trace Requirements Analysis跟踪要求分析Trace Elements Geochemistry微量元素地球化学trace decay theory of memory记忆痕迹减退论trace-interpretive program追踪解释程序Trace logs are text files.跟踪日志均为文本文件。trace rare-earth additions微量稀壬添加剂