为了理解这其中的原因，让我们以用户在屏幕上错误地输入数据后创建系统错误时的非故意用户错误的风险为例。
To understand why, let's consider the risk of unintentional user error when the user creates a system error after incorrectly entering the data on the screen.
图中以两个工序，上游工序和下游工序为例，其中上游工序为下游工序供应零部件。
Illustrated in it are two processes, an upstream and a downstream process, where the upstream process supplies parts (items) to the downstream.
让我们以一个简单X ML文档(包含一个组织的员工列表)为例，将它添加到一个GAE项目，为其中的每个元素创建一个类，然后将它们存储为实体。
Let's take a simple XML document containing the list of employees at an organisation, add it to a GAE project, create a class for the elements, and store them as entities.
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