be expert at (doing) sth
at 后面接名词或动名词，强调在某项具体活动或技能上很熟练。
She is expert at handling difficult customers.
她擅长应对难缠的顾客。
熟练的；内行的；精通的
专门的；需要专门知识的；能力或知识非凡；专家的特征。；具有或展示知识、技能和能力的；与需要特殊知识才能理解的相关
having or showing great knowledge or skill; typical of an expert
能力或知识非凡
Extraordinary capable or knowledgeable.
专家的特征。
Characteristic of an expert.
具有或展示知识、技能和能力的
having or showing knowledge and skill and aptitude
与需要特殊知识才能理解的相关
of or relating to or requiring special knowledge to be understood
She is an expert cook, able to prepare complex dishes easily.
她是一位专业的厨师，能够轻松准备复杂的菜肴。
用法提示：此处expert用作形容词，修饰名词cook，表示“专业的”。
AI contextual example
We need an expert opinion on this legal matter.
我们需要关于这个法律问题的专家意见。
用法提示：此处expert用作形容词，修饰名词opinion，表示“专家的”。
AI contextual example
He gave me some expert advice on how to improve my resume.
他给我一些关于如何改进简历的专业建议。
用法提示：此处expert用作形容词，修饰名词advice，表示“专业的”。
AI contextual example
at 后面接名词或动名词，强调在某项具体活动或技能上很熟练。
She is expert at handling difficult customers.
她擅长应对难缠的顾客。
in 后面多接知识领域、学科或研究范围的名词。
He is expert in ancient Chinese history.
他精通中国古代史。
作定语时直接置于名词前，前面通常加冠词或限定词，不用 be 动词。
The court relied on expert testimony.
法庭依据了专家证词。
grammar · medium
易错句子He is expert of mathematics.
正确表达He is expert in mathematics.
形容词 expert 表示“在……方面很在行”时，固定搭配是 be expert in/at，不能用 of；of 不能引出形容词 expert 所涉及的领域。
grammar · medium
易错句子She is expert to cook.
正确表达She is expert at cooking.
形容词 expert 后面不能接 to do 不定式；表示擅长做某事时，要用 be expert at/in + 动名词，所以 to cook 改为 at cooking。
grammar · medium
易错句子He gave me an expert advice.
正确表达He gave me expert advice.
advice 是不可数名词，前面不能加不定冠词 an；expert 是形容词，直接修饰 advice，整个短语不加冠词。
专家建议
Before buying a house, it is wise to get expert advice.
买房前，征求专家建议是明智的。
专家意见
The article included expert opinions on climate change.
这篇文章包含关于气候变化的专家意见。
专家证人
The lawyer called an expert witness to explain the DNA evidence.
律师请来一位专家证人来解释DNA证据。
专业知识
She has expert knowledge of ancient Chinese history.
她拥有中国古代史的专业知识。
内行的眼光
An expert eye can spot a fake painting immediately.
内行的眼光能立刻看出赝品画作。
专家常提供专业建议，与 expert 构成常见搭配。
专家因在特定领域拥有深入知识而被认可。
专家常进行深入分析，以得出专业结论。
专业能力往往来自长期积累的经验，与 expert 密切相关。
专家依靠专业判断来评估或做决策。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.