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 protein微量蛋白(质)trace program跟踪程序trace mineral微量无机物traceelements痕量元素tracelessness无痕trace theorem迹定理trace command跟踪指令Trace amounts痕量traced- gas示踪气体trace uranium痕量铀