出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第126页（200字）
自知非自己的力量所能胜任而引退，例她的择偶条件十分严苛，使许多有心追求者都知难而退。
She was so demanding in her choice of a husband that all her would-be suitors were disappointed and gave up