理论家的英文：
doctrinarian
egghead
theoretician
theorist

参考例句：

French painter who was a leading exponent and theorist of the cubist movement.
布拉克，乔治斯1882－1963法国画家，是立体派的主要倡导者和理论家

An armchair theorist deficient in practical experience
缺乏实际经验的空头理论家

He was an outstanding Marxist military theorist.
他是卓越的马克思主义军事理论家。

Party ideologists accused her of deviation from communist doctrines.
党内理论家谴责她背弃了共产党的信条。

Theorists had been busy, too, during these hectic months
在这令人兴奋的几个月内，理论家也在忙碌不息。

Pavlov was no shining light as a theorist despite his experimental contributions.
巴甫洛夫虽然在实验方面贡献很大，他却不是一个杰出的理论家。

When efficient-market theorists come across a market anomaly, they tend to dismiss it in one of three ways.
当有效市场理论家看到一个市场不规则表现，他们会用三种方法把这种现象解释掉。

His program found one that a group of Harvard theorists proposed at almost the same time.
它的程序找到的一种材料，与哈佛的一个化学理论家小组同时提出来的相同。

An advocate of a particular ideology, especially an official exponent of that ideology.
理论家，倡导者某一理论的提倡者，尤指对此意识形态的正式阐释。

The theorists from academe, we found, were wrestling with the same concerns
我们发现，学院里的理论家们也正在为同样的问题而苦思冥索着。

doctrinarian是什么意思：
a. 空论家;理论家
egghead是什么意思：
n. 有知识的人，受过高等教育的人，理论家
theoretician是什么意思：
n. 精通于理论的人,理论家