Thanks: This poem expresses the author's sincere thanks to his friends. Friends generally don't show mountains and rivers, but as long as they see his calligraphy and paintings, they are as atmospheric as dragons and snakes dancing together. The colors they draw can only be seen in dreams, and they even want to collect his paintings. This metaphor expresses the author's high affirmation of his friends' paintings and his appreciation of beautiful things. What he said to his friends at the end expressed the author's firm confidence that his friends would shine in the future. The whole poem begins with the contact between friends and ends with their bright future, which not only shows the superb calligraphy and painting skills of friends, but also expresses the profound friendship between friends.