介绍 LangChain 的典型用例图及其应用场景，帮助用户快速上手使用 LangChain。
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#3332 的续篇，继续介绍模块所对应的典型用例文配视频：一图带你了解 LangChain 的典型用例继续 LangChain 官方做了一个典型用例图，原推 也还比较受认可，继续配了一个视频的讲解，用于介绍我们接触了 LangChain 之后可以很快上手做些什么。
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