前车可鉴

Explanation: KAM: the idea was learned. Refers to the failure of a previous lesson. 　　Usage: The main predicate; as the predicate clause; for human 　　Source: "History of Qing Dynasty Liu Yunke Biography": "foreigners in Guangdong had to ask, Till the dawn to the silver, the nuisance endlessly repetitive as the previous lesson." 　　Examples: Lu Xun's "Janus-faced five-_set_ translation order": "syntax is also sometimes about by some impact, and ~." Thesaurus:  Cover thyself, Ring Car Cover, Forefather False step Hand down To slip