经典电磁理论是四维协变的，相对论时空概念的改变是根本性的改变。
The change of time and space concept of theory of relativity is right-about.
所谓经济控制论，就是控制理论的概念与方法在经济学中的各种应用。
The Economic cybernetics describes the economy by the control theory concept and the method.
所谓经济控制论，就是控制理论的概念与方法在经济学中的各种应用。
The Economic cybernetics describes the economy by the control theory concept and the method.
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