"The yellow leaves of the old garden grow moss, and the corner of the city is sad after the dream." The scenery of the old garden has been covered with yellow leaves, and the stone steps are covered with moss. "Yellow leaves" represent late autumn and also symbolize a lonely mood: "Old! It's time to go home! " The poet's hometown is deserted, and so is his mood. A piece of "yellow" a piece of "green" leaves, but also a piece of "yellow" moss, this color, this emotional appeal, how can it not be heartbreaking!