有机化学基本概念在一定的条件下有其确定的内涵和外延，且又随着时代发展和科技进步以及人们认识的深入，其内涵和外延发生变化。对内涵和外延发生着变化的概念，要运用发展的观点来认识，全面了解概念的形成意义、阶段特点和发展过程。对内涵和外延上存有“交集”或“包含与被包含”关系的化学基本概念，学习时要注意运用数学等相关学科的知识来帮助认识。对读音相似但词义不同的化学基本概念，认识的时候应把握住认识规律，将概念之间自然的相互关联进行系统化。对于同一概念在不同的教科书中用语的不同，以权威工具书界定的内涵和外延为准。

The basic concepts of organic chemistry have definite connotations and extensions under certain conditions, and their connotations and extensions change along with the development of times, the progress of science and technology and deepening understanding. It is necessary to understand the connotations and extensions of the concepts with a developmental viewpoint, so as to have a comprehensive knowledge of the concepts' formation meaning, stage characteristics and development process. For the basic concepts of chemistry with the relationship of "intersection" or "inclusion" in connotation and extension, we should use the knowledge of mathematics and other related disciplines to help us understand them. For the basic chemical concepts with similar pronunciation but different meanings, we should grasp the law of cognition and systematize the natural correlation between them. For the different expressions of the same concept in different textbooks, the connotation and extension defined by authoritative reference books shall prevail.