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.

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学习曲线的建立基于三个基本假设。

Learning curve was based on three hypotheses.

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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.

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