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275页（215字）
坚守信用不变，例为顾客提供最佳品质的产品，是这家公司几十年来始终信守不渝的宗旨。
In order to give its customers the best quality goods，it has never wavered in its pledge which was made several decades ago．