科学家在不断重新制定对环境什么是有利的，什么是有害的的标准。
Scientists are continually redefining the standards for what is beneficial or harmful to the environment.
对亚历山大和拿破仑的行为，不能简单地说有益或有害，因为我们说不出它为什么有益和为什么有害。
It is impossible to say of the careers of Alexander and of Napoleon that they were beneficial or harmful, seeing that we cannot say wherein the benefit or harm of humanity lies.
老头子说他早年想不通为什么盗窃是对社会有害的，因为那有助于资源重新分配，让财富从富裕的个体流动到贫穷的个体有什么不好。
In the early stages of my work on crime, I was puzzled by why theft is socially harmful since it appears merely to redistribute resources, usually from wealthier to poorer individuals.
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