That's one of the most profound insights to come out of the historical study of complex institutions like civilizations.

这是我们在对文明，这样复杂制度的历史研究中最大的领悟。

For a reason similar though less cogent, I do not urge historical study.

出于类似但不太令人信服的原因， 我不敦促进行历史研究。

For example, afrocentrism is a school of thought that re-centers historical and sociological study on the contributions of Africans and African-Americans.

例如，非洲中心主义是一种思想流派，它重新将历史和社会学研究集中在非洲人和非裔美国人的贡献上。

He continued to write thereafter and his four volume A History of the English-Speaking Peoples, published between 1956 and 1958 is broadly speaking considered one of his most accomplished historical studies, one which is still well regarded today.

此后他继续写作，他于 1956 年至 1958 年间出版的四卷本《英语人民史》被广泛认为是他最有成就的历史研究之一，至今仍受到好评。

Let him once feel the problems of the present, and his historical studies will become significant; let him know what other men have discovered and thought about his problems, and he will be ready to deal with them himself.

让他感受一下当下的问题，他的历史研究就会变得有意义；让他知道其他人对他的问题的发现和想法，他就会准备好自己解决这些问题。