trace² n 1 [C,U] a small sign that someone or something has been in a place 踪迹，行踪，痕迹: We found no trace of them on the island. 我们在岛上没有发现他们的踪迹。 disappear/vanish without trace (=disappear completely) 消失得无影无踪 2 [C] a very small amount of something, which is difficult to notice 〔难以察觉的〕微量，少许: There was a trace of sadness in his voice. 他的声音中有一丝悲伤。