默写《望庐山瀑布》和《登鹳雀楼》。
望庐山瀑布
                                    
                                   
                                    
                                    
                                    
登鹳雀楼
                                    
                                    
                                    
                                    
                                    
这两首诗分别表达了作者怎样的思想感情？