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经过对这些产品长达几年的研究，我写了一本关于它们是如何运作的书。

After studying these products for several years, I wrote a book about how they do it.

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经过对患病桑蚕研究，他发现了两个很重要的现象。

When studying ailing silkworms, he made two vital observations.

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Relative to the whole market, It's well known that over periods of multiple decades the market has a tendency to go up.

是和整个市场相关的对吗，我们都知道经过几十年的时间周期,市场会有上涨的倾向。

麻省理工公开课 - 计算机科学及编程导论课程节选

The precision of that,of course, is not to be taken seriously, but it gives you a general idea of when we are talking about.

当然,这个时间的精确度,并没有经过严格考证,但是它使我们对这件事的时间有个大体的概念

耶鲁公开课 - 古希腊历史简介课程节选

So I imagine in the last 5 years you had a really kind of go through your own process of integration in some way of what has come of this both personal and public reflection.

所以我想在过去的5年你一定,在某些方面上对自己和,公共的反应上经过了,一定的融合的过程吧。

普林斯顿公开课 - 人性课程节选