n. a just detectable amount
n. an indication that something has been present
n. either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree
n. a visible mark (as a footprint) left by the passage of person or animal or vehicle
n. 痕迹, 踪迹, 微量, 迹线, 缰绳
vt. 追踪, 回溯, 描绘
vi. 追溯, 沿路走
1. She used a pencil to trace the outline of the picture.
她用铅笔描绘了图片的轮廓。
2. The detective tried to trace the missing person's last movements.
侦探试图追踪失踪者的最后行踪。
3. You can trace your family history using online resources.
你可以使用在线资源追溯你的家族历史。