Appreciation: In the sentence "Sleeping at midnight and listening to the wind and rain", the author can't sleep at night because of "thinking". If he can't sleep, he will feel the wind and rain of nature more truly. From the storms of nature, he will think of the stormy country, and from the stormy country, he will naturally think of the storm of war and the military life in his prime. In this way, while listening and thinking, I turned to a special dream-"Iron Horse Glacier". "Dreaming" reflected the sadness of political reality: the poet wanted to serve the country but was rejected, so he could not kill the enemy, and his feelings of defending the enemy could only be shaped in his dream. The Dream of Tiema Glacier is the result of the poet's thinking day and night, which vividly expresses the poet's heroism. This is also the aspiration of a generation of people with lofty ideals and the national justice of the Southern Song Dynasty.