What are the main techniques used in the four rhymes of Homesickness?

The Four Rhymes of Homesickness mainly adopts rhetorical devices such as metaphor, personification and contrast. It is also a famous poem by Mr. Yu Guangzhong, a famous poet, cultural celebrity and scholar in Taiwan Province, and its poetry genre belongs to modern poetry. The whole poem is rich in content and deep in feelings, which directly expresses Mr. Yu Guangzhong's yearning for his hometown. He hoped that the belief in the reunification of the motherland and persistent homesickness would be integrated, which further deepened the artistic appeal of the poem, and he also adopted a direct lyric way.