Functional relationships permeate every part of science. 函数关系渗透自然科学的每个部分。
The mathematical model in economic management is usually determined by economic laws and functional relations,with relative limits in econometrics,etc. 经济管理中的数学模型通常是由一定的经济规律和函数关系所确定,在计量经济学等模型中常常带有相关性方面的约束。