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155页(231字)
比喻正确的不能改变的道理,也指理所当然,不容怀疑,例父母生养之恩昊天罔极,故为人子女者孝顺父母乃是天经地义的事。
In order to show their deep gratitude to their parents,it is only right that they in turn should be filial to their parents.