2. The main metaphor is that catkins will not fly when they are stained with mud, indicating that the mood is silent and no longer fluctuates.
3. Allegory is the main feature of this poem: The hundred-tongued orioles in the poem seem to refer to Zhang Dun, Ceng Bu, Cai Jing and others in the new party at that time, satirizing them for their eloquence, deceiving you and excluding dissidents.
Theme: Expressed the author's deep concern about real politics and satirized the traitor in power.