The following is a poem to express the deep brotherhood: Seven Absolutes, Brothers Blood is thicker than water, and the strength of brothers is greater. Invincible in every attack, invincible in every battle, brothers in arms. This poem expressed the feeling that blood was thicker than water, and the friendship between brothers was even deeper. At the same time, the strength of the brothers working together and supporting each other was very strong. In battle, no matter who encountered difficulties, as long as the brothers were together, they could overcome the difficulties together and win. This poem also emphasized that the kinship between brothers was more important than anything else, whether it was on the battlefield or in life, the friendship between brothers could not be separated.