在这一部分，我主要研究了两个问题。

In this part, I have mainly studied two questions.

youdao

我的结论不是基于任何个体研究，而是基于对每个主要英语国家进行的数千项研究的大规模系统回顾。

I base this conclusion not on any individual study, but on large-scale and systematic reviews of thousands of studies conducted in every major English-speaking country.

youdao

最近我研究了年轻人的饮酒问题，很明显这是政府目前一个主要关注问题。

Recently I've looked at young people's drinking and it's obviously a major concern to Government at the moment.

youdao

So one of the first things that I'll argue for in terms of " healthy research is "let's also focus on what is working".

首先，我认为在健康研究方面,主要的问题是“让我们注重可行的方法。

哈佛公开课 - 幸福课课程节选

So the major controversy behind stem cell research, at least as far as I understand it,

干细胞研究背后的主要争议，就我的理解来说，

干细胞和伦理 - SpeakingMax英语口语达人

I study child development for a living and I'm interested in several questions.

我主要研究儿童的发展,我对很多问题都感兴趣

耶鲁公开课 - 心理学导论课程节选