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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The boundary between two adjacent layers in the OSI model.

在开放系统互连模型中两个相邻层间的边界。

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Two types of model with three layers structure based on BP artificial neural network to forecast soil moisture have been set up.

本文开拓了膜下滴灌条件下棉花水分响应模型建模理论的新思路。 （2）建立了两种三层结构的BP人工神经网络模型预报土壤墒情。

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Unfortunately for snow enthusiasts, the model found that the fragile needle-like ice crystals connecting the two layers can be broken easily and separated by the weight of new snow or a skier.

MSN: How a deadly avalanche can be triggered