trace的中文意思、音标与词形变化

n. 痕迹, 踪迹, 微量, 迹线, 缰绳 vt. 追踪, 回溯, 描绘 vi. 追溯, 沿路走

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