Du Fu's Du Fu Allusions

In the poem Du Fu, Du Fu called the matter of birds and cuckoos a matter of people and officials, saying, "I often worship again, but I don't see the emperor in Chengdu. Instead, I worshipped the cuckoo to express my loyalty to the emperor. "I can't worship because of illness" and "I burst into tears." Another example is the poem "Huai Ye Han Tao". When I watched the cold washing of Sophora japonica leaves, I thought that "Jun should be cool late, and this taste should be timely", so I thought of offering a cold washing to the emperor to show my sincerity to the emperor. These obviously show the vulgar side of Du Fu's loyalty and righteousness.