He considers himself an expert.

他认为自己是专家。

《牛津词典》

We need some expert help.

我们需要一些内行的帮助。

《牛津词典》

They are all expert in this field.

他们都是这个领域的行家。

《牛津词典》

University of Pennsylvania professor Arthur Caplan is bioethicist -- an expert in ethical and moral issues of biological medicine and technology.

VOA: special.2010.07.20

Word expert Mitford Mathews says that as early as eighteen fifty-four, an American publication used the words peanut agitators.

VOA: special.2010.10.03

Mister Legiardi-Laura, poet and writer Joe Ubiles and arts education expert Amy Sultan founded the program in two thousand one.

VOA: special.2009.04.27

The 'Movie Wizard' also allows users to create and edit expert-quality videos easily from the touch screen.

ENGADGET: Samsung announces EK-GC100 Galaxy Camera with Android Jelly Bean, massive 4.8-inch display, 21x zoom, WiFi and 4G connectivity (hands-on)

Former CID officer Kenneth Simpson - a drug expert - told the jury that was a "huge amount" of cannabis.

BBC: Lawyer Gerard Nesbitt jailed over 31kg cannabis haul

Previously, criminal charges were filed against eight consultants and staff of Primary Global Research LLC, a California expert-network firm.

WSJ: Insider-Trading Suspect Smashed Evidence