为了介绍如何使用ZODB，以及说明其属性，我们将演示三个基本操作：首先，我们将介绍如何建立和断开到ZODB的连接。
To show how to use the ZODB, and to illustrate its properties, we will demonstrate three basic operations: First, we will show how to set up and tear down a connection to the ZODB.
学习曲线的建立基于三个基本假设。
建立了统一的桥梁风险损失概念模型，提出了由损失幅度模型、损失价值转换函数、损失时间价值模型三个基本模型组成的桥梁风险损失量测的通用方法。
A uniform risk loss model are defined, and a basic loss estimate method is also proposed, which is composed of loss extent model, loss value conversion model, loss time value model.
第三部分：通过文本修辞、视听修辞和肢体修辞这三个部分，建立电影演讲修辞上的基本结构，发现其创作规律。
The third part: through playwrights' creation, directors' creation and actors' performance, the basis structure of movie speech is set up and its rules are found out.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
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