1, because the poet and Han Shen met suddenly after a long separation, which is suspected to be a dream, just showing the pain of acacia after the last time and the difficulty of this meeting. Doubtful Dream is not only sincere, but also vividly shows the poet's joy and surprise. (That's right)
2. The third lyric borrows scenery, which not only describes the real scenery, but also describes people's mood. It not only exaggerates the poet's sad and gloomy mood, but also symbolizes the vagaries of this personnel. (That's right)