单纯的物质 meaning in Chinese

a simple substance mixture

Usually it is hard to get a simple substance .
一般得到一种单纯的物质很困难。
Secondly , what are advantages and disadvantages brought by it and how to prove ? mostly affected by adam smith , especially by his theory , the traditional research about division of labor is still based on the stable man characters and the simple material relation system between economical variables , which makes the research static , solitary and far away from historical aspect
也许是受到斯密? ?特别是被人们称为“斯密定理” ? ?研究传统的影响,传统的分工理论在研究方法上,基本上都是假定不变的人性基础,以各经济变量之间单纯的物质关系构建理论体系,因而它们的研究是静态的、孤立的、缺乏历史方向感的研究。