"Often the language is easy, strange language is difficult, and the beginning of this poem is also closed. Strange language is easy, but common language is difficult, so this poem is also important. Fragrant hills are often used strangely, and this place is not easy to get. "It's easy to write ordinary sentences, but it's difficult to write strange sentences. This is the entry point of poetry. It is easy to write strange sentences, but it is difficult to write plain and meaningful sentences, which is the second pass of poetry. Bai Juyi used plain sentences and strange sentences with his heart and mind, and he was superb. This realm is not so easy to practice!