B2 someone who has a lot of experience, knowledge, or skill in a particular subject专家;专业人员
UK also consultant a doctor who has special training in and knowledge of a particular area of medicine专科医生
More examples
Her doctor was at fault for not sending her straight to a specialist.
My doctor has referred me to a specialist for a second opinion on the results of my blood test.
She's a specialist in Ancient Greece.
You'll need a specialist to do that woodwork.
We took specialist advice on restoring our cottage.
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