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118页（201字）
自知非自己的力量所能胜任而引退，例她择偶的条件十分苛刻，使得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