Wise after the event, wise too late.
(With the and plural concord) such people as a class.
Late 16th century; earliest use found in Richard Mulcaster (?1532–1611), schoolmaster and author.
英汉双解词典包含464360条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。