Liu Yuxi's poems: pay attention to contrast, the first two sentences recall the complexity of the past, and the last two sentences describe the desolation and reasons of today.
Wei Zhuang's Poems: The whole poem is set off from the side, and the infinite pain and emotion of people are set off by the "ruthlessness" of natural scenery. Or: the whole article focuses on describing the real scenery, which contains feelings ("borrowing scenery to express feelings"). Rainy, Cao Jiang, birdsong, Liu Yin and other scenery render a sad picture.