即使练习有时候是有用的，我们也并没有权利下结论说，这种类型的作业对每个学生都有用。

But even if practice is sometimes useful, we're not entitled to conclude that homework of this type works for most students.

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每个ESB都有自己的注册中心，并控制除其自身域之外支持哪种类型的交互。

Each ESB has its own registry and controls what type of interactions are allowed outside of its own domain.

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每个产品文档都有一个惟一产品ID以及浏览目录时常常使用的其他重要信息，包括种类、品牌和名称。

Each product document has a unique product ID, as well as other vital information that is commonly used when browsing the catalog, including category, brand, and name.

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