(2)① The poet personifies birds and mountains by anthropomorphic rhetoric, expressing the author's sadness. (2) By means of comparison and contrast, the feelings of the water-separated mountain and the ruthlessness of bird watching are compared. (3) "Melodious" and "Wan Zhuan", the former is disyllabic, and the latter is rhyme, which euphemistically expresses the poet's inner lingering because of sound. (4) Three or four antithetical sentences with neat and coherent meanings: The poet wakes up from the singing of birds, sees the mountains and worries about them, showing a rather complicated psychological process. (That's right)