those who "think" are sharp-Shuo Wen Jie Zi, those who are diligent in thinking are wise, so it goes that "learning without thinking is useless"; As a verb, it means to miss, which refers to the yearning for deep love, such as "green flowers, leisurely thinking about myself"; In addition, it also includes the pursuit of moral cultivation, "Book? Yao Dian notes the cloud: the thought of moral purity. Those who "fly" look like rain and snow-"Shuo Wen Jie Zi", so the article "Picking Wei" says "rain and snow fly". Rain and snow, the spirit descending from heaven, is not only the natural beauty of heaven and earth, but also the source of nourishing everything. And those who "fly" are homophonic "flying", soaring to the sky and aiming high. Ling Yunzhi's spirit of "flying in a swan" is in the gentle elegance of "rain and snow", which can be described as pulling out the dust and pulling out the customs.