这是夹心层的概念。
在第二节里阐述了配光光形的计算，其中涉及透视变换理论和层的概念。
In the second section, calculation the light shape is introduced, the concept of layer and the theory of perspective transform are adopted.
会话含义是意义层的概念，系统功能语言学理论非常重视对意义的研究，认为意义系统是由社会符号所决定的。
Conversational implicature is the concept of meaning. It is held in systemic functional linguistics that the meaning is determined by the social semiotics.
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