Answer: The big forest is also the central image of the whole poem. It is a product of the poet's artistic imagination, rather than a realistic representation of the barren slopes and ditches. This image is undoubtedly a symbol of the country and the nation. Its hustle and bustle, its vitality and corruption, its metabolism and forgetfulness are reminiscent of the history that needs urgent reflection and cleanup after the national catastrophe that just passed. with reality.