It is a metaphor.
Metaphor is a commonly used rhetorical technique. It uses something similar to something to describe or explain something. It is one of the rhetorical figures. Metaphor can be divided into simile, metaphor (metaphor) ) and metonymy.
Archaic poetry is a poetry genre, which is divided into four-character poems, five-character poems and seven-character poems according to the number of words in the verses. Ancient style poetry is opposite to modern style poetry. It has free rhythm, does not require confrontation, is flat and oblique, has wider rhymes, and is not limited in length.