betterment
n. 改善，改进；改良；涨价
例句
His research is for the betterment of mankind.
他的研究是为了人类生活的改善。
《柯林斯英汉双解大词典》
They said psychoanalytic thinking could make for the betterment of society.
他们说精神分析思想会让社会得到改进。
And that we need to be leading on not only for the betterment of our nations, but the world, "she said."
同时，为了我们两个国家的福祉乃至全世界的福祉，我们两国都应当起领导作用。
