What kind of expression techniques are mainly used to describe pines and cypresses?

1, this poem mainly adopts the method of overall setting off (setting off), which means feelings through the nobleness of pine trees and encourages followers. Specifically, in the first three parts of the poem, in order to express the unyielding noble character of pine trees from the outside to the inside, the wind and bad weather in the valley are used to set off pine trees so that the cold wind can blow, and the noble character of pine trees is indomitable in the cold and strong wind, which is self-evident.

2. This poem as a whole can also be understood as the use of symbolism. Pine trees symbolize their interests, sentiments and pursuits. Pine trees in nature are left to their own devices, which have nothing to do with people, and do not have any noble character as the poet said. It is the poet who cares for the pine tree with affectionate eyes, which makes this pine tree have some characteristics of being attached to people. The author uses this symbolic technique to hold his arms and symbolize his interest and pursuit. The use of this symbolism is not uncommon in ancient poetry.