what from the point of view of society is necessary labor is from （his） own point of view voluntary play.
从社会角度来看必须付出的劳动而在个人来看就是自愿选择的娱乐.
我记得应该有个his.
明白吗?通俗说下,from the point of view of society ,labor是necessary的,from （his） own point of view is voluntary play.