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156页(206字)
话说得有道理,例对一个问题了解得越透彻,谈论起来就越能言之成理,无法驳斥。
The deeper the knowledge and understanding one has of a problem,the more convincing one can be when speaking about it.