一个是外在的形象，另外一个才是内容实体。
One is the appearance, the expression, while the other is the reality, the content.
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资料内容不会追踪已中断连接之实体的状态。
The data context does not track the state of disconnected entities.
介绍了最小实体要求的基本内容。
The least material requirement was introduced.
应用推荐
模块上移
模块下移
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