清渭浊泾

Explanation: "Poetry Bei Feng Valley Wind": "Wei Jing to cloud, Shi Shi, the islet." Brief Account Shu: "Wei Jing water to have, it is reflected in its cloud." That Wei Qing Gu, Jing water turbidity, due to the " Qing Jing Wei cloud. " Also Yiyu Comparing the two, right and wrong good or bad seasons. 　　Source: "Poetry Bei Feng Valley Wind" by Wei Jing cloud, Shi Shi, the islet. "Brief Account of water to have Wei Shu Jing, it is reflected in its cloud."