The expression of homesickness and four rhymes has a prominent feature. What is this characteristic? What is the expressive function?

The four rhymes of homesickness are mainly expressed by images and lyrical by images. Symbols and associations in the whole poem are closely linked, and four images with China characteristics and individual style are selected in turn to express the poet's unforgettable homesickness complex, thus making the whole poem implicit.

The whole poem adopts the lyric way of direct expression. As a famous poet who was born in the mainland and became famous in Hong Kong and Taiwan, affection, nostalgia and patriotism became the main direction of his poetry creation.

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Poetry is the art of expressing feelings, but the expression of such feelings is taboo and empty. Therefore, poets often choose some "emotional equivalents" (images) to express their feelings, so that poems have implicit and lasting expression effects.

In Yu Guangzhong's four verses of Nostalgia, four images with China characteristics and individual style are selected in turn to express the poet's long-accumulated homesickness complex. The first paragraph, "Give me a spoonful of Yangtze River water, Yangtze River water", started with a call and was repeatedly sung. "Yangtze River Water" is thought-provoking and intriguing.

It is the gurgling spring that naturally moistens all things, the sweet milk that mothers feed their children, and the long tenderness that the motherland soothes wanderers. The poet's deep call for the wandering world is like the longing, anxiety and pain, persistence and obsession of travelers who have crossed the desert and suffered from drought for Green State and Qingquan.