This is the 95th most frequent Chinese word.
研究
"研究" means "to research" or "to study."
In this sentence, '研究' is used as a verb meaning 'to study or investigate'.
我们正在研究这个项目。
We are researching this project.
Here, '研究' is used as a noun to mean 'research'.
他的研究成果非常重要。
His research findings are very important.
In this case, '研究' is used as a verb indicating the action of studying in detail.