蛛丝马迹 [- - mǎ jì]spider's web and horse's footprints — traces (for detective work); thread of a spider and trail of a horse — clues [traces]; the gossamer threads of a spider and the trail of a horse:
•¶ 至今还没发现任何有关这一神秘事物的蛛丝马迹。 No clue to the mystery has been found.