The four grades of the famous poems are as follows:

1. the bright moon lifts from the Mountain of Heaven, in an infinite haze of cloud and sea. (Li Bai's Guan Shanyue)

Appreciation: Li Bai's poem still inherits the ancient Yuefu in content, but its brushwork is unique, and it is innovative. The poet described the hardships and hardships of ancient border guards, condemned the sufferings brought to the people by unjust wars, so as to insinuate and criticize the militancy of the ruling class in the Tang Dynasty, and showed the theme of opposing the war of aggression.

2. All the birds fly high, and the lonely clouds go to leisure alone. (Li Bai's Sitting Alone in Jingting Mountain)

Appreciation: These two sentences are "dynamic" to see "static" and "dynamic" to set "static". This kind of "quietness" reflects the loneliness and loneliness of the poet's mind. This vivid way of writing can give readers association, and implies that the poet has been visiting Jingting Mountain for a long time, sketching out his image of "sitting alone" and paving the way for the next couplet to "never get tired of looking at each other".

3. but toward which corner of the mountain, how can I tell, through all these clouds?. (Jia Dao's a note left for an absent ecluse)

Appreciation: The last two sentences of the poem say that he also told me: It is in this mountain, but the forest is deep and dense, and I don't know his whereabouts. Here, the question "Where are the herbs?" is omitted, and the boy of "but toward which corner of the mountain" answers the words, including the question implicitly. The last sentence, "how can I tell, through all these clouds?", is the boy's answer to the question of whether the herb picking is in front of the mountain, behind the mountain, at the top of the mountain and at the foot of the mountain.