The two things have opposite characteristics in terms of nature, size, appearance, etc. When people recognize one thing, they think of the other from the opposite side. This kind of association is called contrast association. Based on the above definitions, the following associations are used in the following verses:. ['Liu Yuxi\'s Wuyi Lane: "In the old days, Wang Xietang swallowed up and flew into the homes of ordinary people. ".', 'Su Shi\'s "Niannujiao Chibi Nostalgia": "Going to the east of the river, the waves are gone, and the people of all ages are popular. On the west side of the old base, the humane is the Three Kingdoms Zhoulang Chibi. ".', 'Li Yu, "When is Yu Meiren\'s Spring Flowers and Autumn Moons?": "The carvings and jade blocks should still be there, but Zhu Yankai. How sad is it to ask Jun? It\'s like a river springs to the east. ".', '"The Book of Songs Guan Guan": "Guan Guan Zhuo Qiu, in the river\'s continent, a lady, a gentleman is good. ".']