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LangExtract is Google's open-source programmatic extraction tool that transforms unstructured text into structured, traceable data with character-level offsets. It enables efficient long-document processing, multi-round extraction for recall, and direct structured output, reducing traditional RAG overhead. This guide demonstrates building a knowledge graph chatbot using Streamlit, Agraph, and LangExtract with dynamic few-shot template selection. LangExtract是Google开源的程序化抽取工具，可将非结构化文本转化为可追溯的结构化数据，通过字符偏移实现高亮验证。它支持长文档分块并行处理、多轮抽取保证召回率，并直接生成结构化结果，减少传统RAG流程开销。本文演示了使用Streamlit、Agraph和LangExtract构建知识图谱聊天机器人，实现动态few-shot模板选择和实体关系并行抽取。

LangExtract is Google's official open-source Python library designed for extracting structured data (JSON, Pydantic objects) from text, PDFs, and invoices. Unlike standard prompt engineering, it's built for enterprise-grade extraction with three core advantages: precise grounding (mapping fields to source coordinates), schema enforcement (ensuring output matches Pydantic definitions), and model agnosticism (compatible with Gemini, DeepSeek, OpenAI, and LlamaIndex). This guide provides practical insights for Chinese developers on local configuration, cost optimization, and handling long documents. LangExtract是Google官方开源的Python库，专为从文本、PDF和发票中提取结构化数据（JSON、Pydantic对象）而设计。与普通Prompt工程不同，它为企业级数据提取打造，具备三大核心优势：精准溯源（字段可映射回原文坐标）、Schema强约束（保证输出符合数据结构）、模型无关性（兼容Gemini、DeepSeek、OpenAI及LlamaIndex）。本指南基于真实项目经验，涵盖国内环境配置、API成本优化和长文档处理技巧。

Gemini is Google DeepMind's largest and most capable AI model, designed for efficient operation across devices from data centers to mobile. It outperforms GPT-4 in most tasks and comes in three versions: Ultra for complex tasks, Pro for general use, and Nano for on-device applications. (Gemini是谷歌DeepMind开发的最大、能力最强的人工智能模型，可在数据中心到移动设备上高效运行。在多数任务上表现优于GPT-4，提供Ultra、Pro和Nano三个版本，分别适用于复杂任务、通用场景和端侧应用。)

This article explores the ethical boundaries of Google search manipulation and SEO practices, examining technical methods, their impact on search integrity, and the evolving landscape of search engine optimization. (本文探讨了谷歌搜索操纵与SEO实践的伦理边界，分析了技术方法、对搜索完整性的影响以及搜索引擎优化的演变格局。)

Gemini 3 is Google DeepMind's latest AI model featuring state-of-the-art reasoning, multimodal understanding, and intelligent agent capabilities. It excels in programming, scientific analysis, and complex task execution with a 1M token context window and multilingual support. (Gemini 3是谷歌DeepMind推出的新一代人工智能模型，具备顶尖推理能力、多模态理解和智能代理功能。它在编程、科学分析和复杂任务执行方面表现卓越，拥有100万token上下文窗口并支持100多种语言。)

AionUi is a free, open-source desktop GUI for Google's Gemini CLI, enhancing AI interaction through an intuitive interface with local data storage, multi-session chat, file management, code diff view, and cross-platform support. (AionUi是一款免费开源的桌面应用程序，为Google Gemini CLI提供图形界面，通过直观的界面、本地数据存储、多会话聊天、文件管理和代码差异视图等功能提升AI交互体验，支持跨平台使用。)

This content provides basic information about Google's official website and company overview, including its founding details, parent company structure, and core business areas such as search engine, internet advertising, and cloud computing. (中文摘要翻译：该内容提供了谷歌官方网站及公司概况的基本信息，包括成立细节、母公司结构以及搜索引擎、互联网广告和云计算等核心业务领域。)

Nano Banana (also known as Gemini 2.5 Flash Image) is Google's most advanced image generation and editing model, designed for fast, conversational, and multi-round creative workflows with unparalleled character consistency and world knowledge. (Nano Banana（又名Gemini 2.5 Flash Image）是谷歌最先进的图像生成和编辑模型，专为快速、对话式和多轮创意工作流程设计，具有无与伦比的角色一致性和世界知识。)

Gemini is Google's advanced multimodal AI model that processes text, images, and other content types, offering versatile applications from content creation to technical development. Chinese users can access it through official platforms or domestic mirror sites. (Gemini是谷歌的先进多模态AI模型，可处理文本、图像等多种内容类型，适用于从内容创作到技术开发的多种应用。中国用户可通过官方平台或国内镜像站点访问。)