many people have realized the positive contribution of work

many people have realized the positive contribution of work to human satisfaction
这里的to human satisfaction 的to是to的什么用法?怎么翻译出来.平时接触最多的to是指向动作对象,那这里是什么用法?看了语法书也没有找到?是给予的意思吗?给人们满足感?还是为了.的目的?