求翻译：《实践论》首先说明了认识对生产和阶级斗争的依赖关系，而在马克思主义理论里，人的社会实践其内容正是生产活动、阶级斗争、政治生活科学和艺术的活动等等。是什么意思？

First demonstrated understanding of the practice on production of class struggle and dependencies, in Marxist theory, human social practice whose content is the production activity, class struggle, political science, and art activities, and so on.