Traceyn.特雷西; 特蕾西tracen.痕迹；微量；踪迹v.追踪；描绘；找出根源trace linearity扫描直线性trace of dyadic并向量的迹trace acetylene乙炔trace of travel游踪traceless criem[法] 不留痕迹的犯罪trace chemistry痕量化学trace-ability溯源traces of lions狮子踪迹trace interrupt追踪中断trace algorithm跟踪算法