This poem is to describe the situation that the two men left each other after a brief meeting in late spring. From the first couplet, "It was long before I met her, and it was longer after we parted, and the east wind started and a hundred flowers blossomed". "East wind" means spring breeze, which means the season; Secondly, the season is pointed out by "hundred flowers", which is for the dusk of spring. In this season, two people who love each other finally come together, but they have to face separation. Meeting each other is extremely "rare", and parting is even more "difficult to give up". Generally speaking, poetry is to write scenery first, and then express feelings; However, here, the author first describes the feelings of separation, and then describes the sad scene, and even highlights the poet's sadness in a "dilemma." The word "difficult" is the poetic eye of the whole article.