I only want to suggest to you with this long preamble that much of the work that lies before us is actually in the past and we have already accomplished it.

我之前讲这么多，只是想让大家知道,这么多的疑问我们之前已经遇到了,并且已经解决了。

耶鲁公开课 - 文学理论导论课程节选

All right. If that sounds like a really long preamble, it is. Let's start with Python.

好，如果上面听起来像一个很长的序文，他确实是，让我们从Python开始。

麻省理工公开课 - 计算机科学及编程导论课程节选