an expert in sth
in 后多接学科或领域，强调专业知识所覆盖的范围。
She is an expert in environmental law.
她是环境法方面的专家。
专家；行家
大师以下级别的棋手；在某一领域有广泛知识或能力的人；具有特殊知识或能力并熟练表现的人；排名仅次于大师的玩家。
a person with extensive knowledge or skill in a particular field
在某一领域有广泛知识或能力的人
A person with extensive knowledge or ability in a given subject.
具有特殊知识或能力并熟练表现的人
a person with special knowledge or ability who performs skillfully
排名仅次于大师的玩家。
A player ranking just below master.
She is an expert in ancient history.
她是古代史方面的专家。
用法提示：名词，表示在某一领域有专业知识的人。
We consulted several experts before making a decision.
在做出决定之前，我们咨询了几位专家。
用法提示：复数形式，指多个具有专业能力的人。
He is considered an expert on climate change.
他被认为是气候变化方面的专家。
用法提示：名词，表示被公认的专业权威。
in 后多接学科或领域，强调专业知识所覆盖的范围。
She is an expert in environmental law.
她是环境法方面的专家。
on 后多接具体话题或专题，语气上偏向某一专门题目。
He is an expert on ancient Chinese history.
他是中国古代史方面的专家。
at 后接动名词，强调擅长某项活动或技能。
She is an expert at negotiating deals.
她擅长谈判交易。
grammar · medium
易错句子She is an expert of Chinese history.
正确表达She is an expert in Chinese history.
expert 作名词表示“某领域的专家”时，用介词 in（谈论具体话题也可用 on）引出领域，不能用 of；of 表示所属关系，与 expert 不搭配，这是汉语“某方面的专家”直译造成的错误。
grammar · medium
易错句子My uncle is a expert in computer science.
正确表达My uncle is an expert in computer science.
expert 以元音音素 /e/ 开头，单数可数名词前要用不定冠词 an，而不是 a；判断依据是读音而非拼写字母。
grammar · medium
易错句子The company hired three expert last month.
正确表达The company hired three experts last month.
expert 是可数名词，前面有数词 three 时必须用复数形式 experts；汉语名词本身不表示单复数，学习者容易漏掉复数词尾 -s。
专家意见
We should seek an expert opinion before making a decision.
在做出决定之前，我们应该征求专家意见。
专家建议
She followed the expert advice and improved her health.
她遵循了专家建议，改善了健康。
专家证人
The court called an expert witness to testify.
法庭传唤了一位专家证人作证。
专业知识
He has expert knowledge in the field of astronomy.
他在天文学领域拥有专业知识。
专家证词
The expert testimony was crucial for the case.
专家证词对案件至关重要。
专家通常具备某一领域的深厚知识
专家往往拥有高超的技能
专家通过积累经验获得专业能力
专家通常经过系统训练
专家可能拥有专业认证
专家证人
The defense called an expert witness to testify about the forensic evidence.
辩方传唤了一位专家证人就法医证据作证。
专家建议
You should seek expert advice before making such a large investment.
在进行如此大的投资之前，你应该寻求专家建议。
专家意见
According to expert opinion, the project is likely to succeed.
根据专家意见，该项目很可能会成功。
任何领域的专家都曾是个初学者。
Remember, the expert in anything was once a beginner, so don't be afraid to start.
记住，任何领域的专家都曾是个初学者，所以不要害怕开始。
专家是那些知道在他的领域中可能犯的一些最严重的错误并知道如何避免它们的人。
He is an expert in software engineering, always avoiding common pitfalls.
他是软件工程方面的专家，总能避开常见的陷阱。
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专家小组
An expert panel was assembled to review the proposal.
组建了一个专家小组来审查该提案。