The international community gradually formed two types of theories: certification theory and reputation theory.
因而国际上逐渐形成了两类理论：认证理论和声誉理论。
A formal degree is seldom needed, but your employer may require certification in the basics of educational theory, group dynamics, and communication.
这里很少授予正式学位，但是学员能获得一些证书，诸如：教育理论基础学，团体动力学以及交流学。
The feasibility of a theory must be tested for certification through the physical.
一种理论的可行性是要通过实物检验来认证的。
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