一门新学科开始，教材一般都要安排一个“引言”，文字不多，又无作业，考试中几乎没有，因而部分师生不够重视．有些教师甚至不讲“引言”内容，或三言两语一带而过；有些学生也感觉“引言”内容空洞，干脆不学更不用说复习理解了．我认为这是学习该门学科的一大失误，俗话说? A new discipline began, teaching materials generally have to arrange an “introduction”, the text is not much, there is no homework, almost no test, so some teachers and students do not pay enough attention. Some teachers do not even talk about “introduction” or go over it with words and phrases. Some students also feel that the content of the “introduction” is empty, not to mention learning, not to mention reviewing and understanding. I think this is a major mistake in learning this discipline. As the saying goes?