前事不忘，后事之师

don't forget past events, they can guide you in future (idiom); benefit from past experience

front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly

past events / antecedent / what has happened

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

no; not so / (bound form) not; un-

to forget / to overlook / to neglect

empress / queen / (archaic) monarch / ruler

back / behind / rear / afterwards / after / later / post-

future events / and what happened next... (in fiction) / funeral arrangements

(possessive particle, literary equivalent of 的[de5]) / him / her / it

surname Shi

teacher / master / expert / model / army division / (old) troops / to dispatch troops