B1 a person with a high level of knowledge or skill relating to a particular subject or activity专家;内行;行家
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We need to bring in an expert to deal with this problem.
He's an expert on 15th-century Italian art.
Bomb disposal experts have defused a 110-pound bomb at Victoria Station.
The competition will be judged by a panel of experts.
Most medical experts believe that breast-feeding is better than bottle-feeding.
B2 having or showing a lot of knowledge or skill专家的;内行的
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We need expert advice, and that's why we've called you in.
A psychiatrist was called as an expert witness for the defence.
There is a wealth of expert knowledge to be found in this university.
At a time like this you need expert help, not just the help your friends can provide.
Could you cast your expert eye over this plan for me, please, and tell me what you think?
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