It often appears in poems to describe scenes. In the Tang Dynasty, Zhang Jiuling wrote a poem "Hukou Looking at Lushan Waterfalls and Springs", and there happened to be a poem that used this word-"Lingshan Beautiful Sky * * *". At the same time, it can also refer to a strong smell, especially aroma. For example, Guo Moruo's "Meng Fuzi Married": "Because what she left behind, after she left, specifically acted on his sense of smell.