Permissible rhythms must be simple, and such as are expressive of a courageous and harmonious life.
such as后面怎么直接接BE动词结构呢?
步骤还原
1) Permissible rhythms must be simple, and [Permissible rhythms must be]such as are expressive of a courageous and harmonious life.
2) Permissible rhythms must be simple, and [Permissible rhythms must be]such [things] as are expressive of a courageous and harmonious life.
然后把方框內的去掉就可以了