生活之树长青。
Forever green is the tree of life.
语境：生活之树常青。一种理论的产生，源泉只能是丰富生动的现实生活，动力只能是解决社会矛盾和问题的现实要求。
译文：As the saying goes, “Forever green is the tree of life.” A theory can only find its inspiration in the richness and vibrancy of real life and in the practical need to resolve social problems.
