不要把 as more than 视为一个整体。在本句中：

1. function as=起……作用；起…作用；扮演…角色。如：

Teachers also function as counselors. 教师还兼顾担任学生辅导员。

The couch was designed to also function as a bed. 这个长沙发还可以当作床来用。

Some English adverbs function as adjectives. 英语中有些副词可作形容词用。

The club serves a useful function as a meeting place. 这个俱乐部是一个会面的好地方。

2. more than=不仅仅是，不只是。如：

To him art seems more than a drawing. 在他看来，艺术不仅仅是一幅画。

Sunglasses are much more than a fashion accessory. 太阳镜不仅仅是时尚的装饰品。

Freedom is more than a purely abstract notion. 自由并不仅仅是一个纯粹抽象的概念。

He was more than a basketball superstar, he was a celebrity. 他不仅仅是一个篮球超级明星，还是一位名人。

3. 句意：

Her room functions as more than a bedroom. 她的房间不仅仅用作卧室。