根据最新的语言分析，川普是最后15个总统里词汇量最贫乏的，基本上在小学四年级。

President Donald Trump—who boasted over the weekend that his success in life was a result of "being, like, really smart"—communicates at the lowest grade level of the last 15 presidents, according to a new analysis of the speech patterns of presidents going back to Herbert Hoover.

The analysis assessed the first 30,000 words each president spoke in office, and ranked them on the Flesch-Kincaid grade level scale and more than two dozen other common tests analyzing English-language difficulty levels. Trump clocked in around mid-fourth grade, the worst since Harry Truman, who spoke at nearly a sixth-grade level.

https://www.cmu.edu/news/stories/archives/2016/march/speechifying.html