This sentence has several meanings:
First of all, the relationship between brothers is a natural blood relationship, which is irreplaceable and irreplaceable. Due to the particularity of this relationship, the friendship and feelings between brothers are very deep and firm, and they get along with each other most truly and frankly.
Secondly, the friendship and affection between brothers are based on mutual understanding, support, trust and respect. They support each other, accompany each other, experience storms together and grow together at many important moments in their life journey. This experience and emotional bond make their friendship more precious, but it is also doomed to be short-lived and limited.
Finally, this sentence also expresses that the friendship and feelings between brothers cannot be copied. Even in the afterlife, there will be no such blood relationship and emotional bond between people. Therefore, people should cherish the friendship and feelings between brothers, maintain and cherish them in this life, and don't wait until they lose them to regret it.
In short, this sentence conveys a kind of treasure and gratitude for the friendship and feelings between brothers, and a kind of short and precious thinking and understanding of life.