What is a clean poem?

65438+-Love Lotus Song Dynasty: Zhou Dunyi

2. Under the mountain, the blue buds are short dipped in the stream, and the sand road between the pines is clean and mud-free. -"Qingquan Temple Huanxi Sand Tour" Song Dynasty: Su Shi

The eaves are long and clean without moss, and the flowers and trees are planted by hand. -Mr. Shu Huyin's Wall Song Dynasty: Wang Anshi

4, the mountains and rivers are clear and frosty, and several trees are dark red and light yellow. -"Two Odes to Autumn" Tang Dynasty: Liu Yuxi

5, thousands of hectares, all mirror net, inverted blue peak. -"Water Tune Song Tou Huangzhou Kuaizai Pavilion Presents Zhang _ _" Song Dynasty: Su Shi

6. The peony demon in front of the court was unqualified, and the pool was full of affection. -"Peony Appreciation" Tang Dynasty: Liu Yuxi