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108页（198字）
用以指意志坚决，决不改变，例半年前，他还誓言海枯石烂心永不变，今日却已别有所恋。
To think that only half a year ago，he swore eternal love to her and today he is interested in someone else!