What is the usage of "sad beauty" in the lyrics of "You are as beautiful as snow"?

You are as beautiful as snow, and the "sadness" in "parting" is also an adjective-to-verb, which means that parting contains a kind of sadness. It is more dynamic and poetic to change "better parting" into "sad parting" Transformation: when making sentences, change the original part of speech of vocabulary, such as changing adjectives or nouns into verbs to use.

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