Teaching model of three layers had played important role in computer base teaching.

三层次计算机基础教学模式对计算机基础教学起到重要的指导作用。

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To show how the defense in depth works, we will first examine a centric model of three primary layers: core, middle, and outermost.

为了演示深度防御的工作原理，我们将首先研究包含三个主要层次的中心模型：核心层、中间层和最外层。

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In view of two layers, the prototype of the crime and the model of the crime, the author separates 'act' into three concepts: natural act, criminal act and act in criminal law.

笔者从犯罪原型与犯罪模型的两个不同层面，将“行为”分为“自然行为”、“犯罪行为”和“刑法上的行为”三个概念。

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