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Update ch4.md #192

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Update ch4.md #192

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2 changes: 1 addition & 1 deletion ch4.md
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Expand Up @@ -313,7 +313,7 @@ Avro 为静态类型编程语言提供了可选的代码生成功能，但是它
* 维护一个模式的数据库允许你在部署任何内容之前检查模式更改的向前和向后兼容性。
* 对于静态类型编程语言的用户来说，从模式生成代码的能力是有用的，因为它可以在编译时进行类型检查。

总而言之，模式进化允许与 JSON 数据库提供的无模式 / 读时模式相同的灵活性（请参阅 “[文档模型中的模式灵活性](ch2.md#文档模型中的模式灵活性)”），同时还可以更好地保证数据和更好的工具。
总而言之，模式演化保持了 JSON 数据库提供的无模式 / 读时模式相同的灵活性（请参阅 “[文档模型中的模式灵活性](ch2.md#文档模型中的模式灵活性)”），同时还可以更好地保证数据和更好的工具。


## 数据流的类型
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