自由
http://cache.baidu.com/c?word=%C3%C0%B9%FA%3B%CE%C4%BB%AF&url=http%3A//www%2Ee%2Doem%2Ecom/chinese/e%2Doem%2Ecom/culture/&b=0&a=3&user=baidu三句两句说不清,你自己看看吧。