This tells people that pine trees are neither grass nor flowers. Grass can't stand frost and snow, and flowers can't stand wind and rain; The pine tree passed the cold test. In the face of freezing and blizzard, it still holds its head high. It's really "heavy snow presses pine trees, and pine trees stand tall and straight." It is this unyielding pride and evergreen style that is often used by Chinese people to compare the longevity of the longevity "longer than Nanshan pine and happier than the East China Sea", expecting the longevity to be happy forever. The evergreen backbone of pine trees is not only often used by China people to deeply bless life, but also its integrity has inspired countless heroes and people with lofty ideals to sacrifice their heads and blood for national justice and human liberation. Once upon a time, I marched into the New Fourth Army in northern Jiangsu. In the danger of "the enemy is besieged by thousands of troops", the officers and men still let go of their voices and sang the battle song "Learn from the pine trees on the top of the mountain in Thailand …", encouraging themselves and inspiring their fighting spirit to kill the enemy bravely, and finally won the final victory of the war.