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237页（192字）
没有弱点可以给人攻击，例这篇文章立论公正，行文严谨，无懈可击。
The article is fair and just and the writing is also to the point．It can be said to be invulnerable to attack．