A recent policy discussion in the journal Science compared the nutrient balances of different agriculture systems.

VOA: special.2009.07.28

and added a structure of math upon it, to build this edifice, which is a very solid edifice of thermodynamics as a science of equilibrium systems.

了这座热力学的坚固大厦，这是一门，平衡态系统,的科学。

麻省理工公开课 - 热力学与动力学课程节选