tracesn.痕迹；遗迹名词trace的复数形式.tracen.痕迹；微量；踪迹v.追踪；描绘；找出根源trace evidence痕量证据trace chromium痕量铬trace elecment微量元素trace analyzer跟踪分析程序Trace Checking痕迹检验trace minerals微量元素trace clinique痕迹诊所trace creating轨迹生成trace language迹语言trace assessor自动座标记录器, X-Y记录器