成語釋疑:草蛇:一條蛇從草叢穿過,不會留下腳印,但蛇有體重,還是會留下一些不明顯卻仍存在的痕跡。 灰線:拿一條縫衣服的線,在燒柴後的爐灰裏拖一下,由於線特別輕,留下的痕跡也是很恍惚的。 現用“草蛇灰線”比喻事物留下隱約可尋的線索和跡像
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