Definition: someone who has a lot of skill in something or a lot of knowledge of something Level: B1
她是欧洲历史方面的专家。
She is an ___expert on European history.
你应该为这个问题咨询一位计算机专家。
You should consult a computer ___expert for this issue.
公司聘请了一位营销专家来提高销售额。
The company hired a marketing ___expert to improve sales.
