colleague
同事；同僚；同仁
a colleague of mine from the office
我办公室的一位同事
We were friends and colleagues for more than 20 years.
20多年来我们既是朋友又是同事。
the Prime Minister and his Cabinet colleagues
首相及其内阁同僚

research
research into sth
research on sth
research on sb
研究；调查；探索
medical / historical / scientific, etc. research
医学、历史、科学等研究
to do / conduct / undertake research
做/从事/进行研究
He has carried out extensive research into renewable energy sources.
他已经对再生能源进行了广泛研究。

of course
(强调所说的话真实或正确)当然
'Don't you like my mother?' 'Of course I do!'
"难道你不喜欢我母亲？" "当然喜欢！"
'Will you be there?' 'Course I will.'
"你会去那里吗？" "当然会。"

来源:可可英语 http://www.kekenet.com/video/201710/525872.shtml