be expert in

基本解釋

Be expert in…
在…方面是專家。
For example, individuals need to be expert in their specialty areas to move up. That tends to preclude branching off into other areas of the community.
例如，在某專業(yè)領(lǐng)域成為專家的人也需要不斷改進(jìn)，需要排除異心與智囊團(tuán)的其他部門協(xié)作。
Travel them, and be expert in home-cosmography.
那末去旅行，成為家庭宇宙志的地理專家。
blog.sina.com.cn

Independent Russian military expert Alexander Golts says the situation suggests that security in the North Caucasus cannot be tightened further.
I'll end by telling you that there's a lot of stuff that we'll be talking about, that I want to talk about, that I am not expert in.
最后還要告訴你們,我們還會講到很多其它的內(nèi)容,是一些我會講到的東西,但我并不是那些方面的專家
耶魯公開課 - 心理學(xué)導(dǎo)論課程節(jié)選
Pop culture expert Robert Thompson says the changes could be seen in film and television as well.

While you may very well be an expert in your field, who knows this to be the case?
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