The preface of "a hundred chants of Xixi": here is a mountain, a stone stream, a path of bamboo, rock and pine. It's graceful and beautiful. It's a green in the distance, so it's called great green. Later generations mistakenly said that Emperor Qianlong had come here to play, and Xingbi changed "Qing" to "Qing", so it was called the Great Qing valley.