Li Yu's Yu Meiren "How much sadness can you have? Just like a river flowing eastward. " How is the expression effect?

Sadness is an abstract emotion. Li Yu turned the hard-to-see emotion into something visible, which made people really feel it. The biggest river is the Yangtze River, and Nanjing, the capital of the Southern Tang Dynasty, is very close to the Yangtze River. Therefore, Li Yu, the king of national subjugation, used the water of the Yangtze River as a metaphor for the pain of missing the motherland, which was profound and impressive. "One River" is meaningful. In spring, the snow melts and disappears, and the river has the largest amount of water. It is endless to use "spring water" as a metaphor for sadness. A river of spring water flows eastward, and the waves are layered on top of each other, just like the new worries overshadow the old ones, which is endless. Li Yu's sadness is not the lingering love and lovesickness, but the hatred for his country, so it is more appropriate to use the majestic spring water as a metaphor, and there is a kind of deep affection that depends on mountains and rivers.