He's done a lot of research on the subject.

他在这方面做了大量的研究。

youdao

He has done a lot of research on that subject.

他对那个课题进行了大量的研究。

youdao

So Hubbub Benson, from the across the river, from the medical school here, has done a lot of research in this area.

所以Hubbub Benson，住在河的对面，也就是医学院的对面，在该领域做了大量研究。

youdao

One of the things I was training was a course called mindfulness meditation, which was developed in the medical school affiliated to Massachusetts, they've done a lot of research on it in terms of helping people with disease, and stress-related disease.

我曾参与过的一个项目,是有关“念“的冥想和修行，是由麻省理工学院下属的,一所医学院研发的，他们为此做了很多研究,旨在帮助人们治疗疾病，和压力引发的病症。

普林斯顿公开课 - 人性课程节选

So it's becoming much more sophisticated, much more interesting and the interesting thing about it is that it verifies a lot of the research that has been done to date with far less sophisticated means, such as self-rapport.

手段更成熟，更有趣，有趣的是,它验证了许多至今通过不全面的方法,所完成的研究的正确性，像自我评估。

哈佛公开课 - 幸福课课程节选

Now, let me just say, I've listened to a lot of stories about this, I've done a lot of research on this.

CNN: Transcript: Clinton speaks on patients' bill of rights

"I had done a lot of research about the treatment and the hospital on the internet before I agreed to the operation, " he said.

BBC: Thalidomide poses new challenges

"It's been a long process to gather all of the information because that was hard to come by so there was a lot of research having to be done to find out all of the names, " said Mr Goodman.

BBC: Memorial unveiled to miners who died at Bilsthorpe pit