众所周知,就宏观与抽象而言,实践是人类适应与改造主观世界和客观世界的一切活动。它既是客观的物质性的活动,又是主观的能动性的活动;这种活动是在一定自然和社会关系中进行的,是历史地变化发展的;实践是人类认识的来源,也是认识发展的根本动力; It is well known that in terms of macroscopical and abstract, practice is all human activity of adapting and transforming the subjective world and the objective world. It is not only an objective and materialistic activity but also a subjective initiative; this activity takes place in certain natural and social relations and changes in history; practice is the source of human cognition and also the basis for understanding development power;