trace

痕迹, 踪迹, 微量, 迹线, 缰绳

a just detectable amount; an indication that something has been present; either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree; a visible mark (as a footprint) left by the passage of person or animal or vehicle

追踪, 回溯, 描绘

追溯, 沿路走

痕迹

追踪