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引言或以具体生动的案例，或以精辟的分析，或以扣人心弦的精巧设问，把你的思绪带进一个陌生而新鲜的课题，使你有一种愉悦的心情和求知的欲望，为你学习新知识作好铺垫，它起“先行组织者”的作用，主要有如下六种功能：１．构建“支架”。引言为你呈现一个“上位”的整体概
Introduce or take concrete and vivid examples, or use insightful analysis, or intricately elaborate design, bring your thoughts to a strange and fresh topic, so that you have a happy mood and a desire for knowledge to learn for you. To lay a foundation for new knowledge, it functions as a “preliminary organizer”. It mainly has the following six functions: 1. Build a “bracket”. The introduction gives you a “overriding” overview