Some videos have been banned on the basis that they are too violent.怎么样不同这里的that they are too violent是作同位语从句讲解basis，还是作定语从句修饰basis？
basis= a reason for doing sth.
the basis = that they too violent = a reason.
所以这是同位关系。
that在从句中不作成分，符合同位语从句结构。
语法和语义二方面证明这是同位语从句。