介绍和结论是论文最困难的部分。

Introductions and conclusions can be the most difficult parts of papers to write.

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我们先简单介绍和分析现有资源共享系统。

We will shortly introduce and review existing resource sharing systems.

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业务模型的介绍和创建。

Introduction to and creation of business models.

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As every time we introduce a new programming concept, we'll relate it back, as we have been doing consistently, to defensive programming.

我们每次介绍一个,新的编程概念的时候，就会和以前讲的联系起来，就和我们介绍防卫性程序设计一样。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, my choice for this is that odd introduction in-between the two stories, and this is on 48 and 49.

因此，我的选择是那个故事的中间,的那篇奇怪的介绍，在48页和49页。

耶鲁公开课 - 1945年后的美国小说课程节选

PROFESSOR: Last time, Professor Guttag introduced the idea of objects and classes and this wonderful phrase called object-oriented programming.

教授：上节课，Guttag教授,介绍了对象和类的概念以及,面向对象编程这个美妙的短语,这是我今天想继续讲的一个话题。

麻省理工公开课 - 计算机科学及编程导论课程节选