What is the function of using two allusions in Chang 'an Autumn Couplet with Wang Wei?

Nanshan is a concrete and tangible individual thing, while "autumn color" is abstract and vague, and it is an artistic means to support emptiness by reality. The concrete and tangible Nanshan sets off the abstract and illusory autumn colors. Through the poem "Autumn in Nanshan is full of momentum", readers not only feel the height of "autumn", but also appreciate its momentum, spirit and character.

Many concrete things with autumn scenery characteristics are not comparable, but this poem sets off the autumn scenery with Nanshan in an ingenious way. The author tends to appreciate the lofty promise of autumn colors, as can be seen from the description of the first two sentences. But the sublime and infinite momentum of autumn is only understandable and indescribable.

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This is a hymn of Gao Qiu. The title is "Looking at Autumn in Chang 'an", but the focus is not on the last word "look", but on praising autumn scenery in Chang 'an in the distance. The style of "autumn" is the direct object of the poet's expression.

The advantage of poetry is that he wrote the poet's spiritual character while writing the scenery of Chang 'an in high autumn. Closer to freehand brushwork. The lofty, vast and clear autumn colors are actually the symbol and externalization of the poet's mind. Especially in the last sentence of the poem, Nanshan and autumn scenery are endowed with a dynamic trend of steep rise. This shows the poet's personality and temperament more clearly, and also makes the whole poem end with a vigorous momentum, leaving room for full imagination.