光通信不能好得只停留在理论层面上。
Optical communication is too good to be left on the theoretical shelf .
国内学术界在理论层面上对证据学说进行了较多的探讨。
The domestic academic circles has carried on more discussions in the theory stratification plane to the evidence theory.
在理论层面上，从语言心理学、认知学和语言教学三个角度出发，系统介绍了整合的理论基础。
From the theoretical perspective, this paper systematically demonstrates the theoretical foundations from psycholinguistic, cognitive and pedagogical angles.
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