It’ s a well-known fact that he shares business interests with them. 众所周知，他与他们分享商业利益。

+for She’ s most well known for her TV work. 她在她的电视作品方面最为出名。

+to/in Our argument against the merger is well known to the company. 我们反对合并的理由在公司已人人皆知了。