2.to be beyond the ken of sb or to be beyond sb's ken在某人的视野之外；在某人的知识范围之外
The quirks of the antiques business were beyond his ken.古董生意里面的那些怪事他一窍不通。
The subject matter was so technical as to be beyond the ken of the average person.该主题专业性太强, 一般的外行人很难理解。