expertise /ˌɛkspɚˈtiːz/ noun Learner's definition of EXPERTISE
[noncount]
: special skill or knowledge : the skill or knowledge an expert has专门知识（或技能）；专长 -
His expertise on defense will help the team.他的防守技术将对球队有益。
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her expertise in legal matters她在法律事务方面的专业知识
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The company has no environmental expertise. [=the company does not have experience with environmental problems, matters, etc.]这家公司在处理环境问题方面不太在行。
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This question falls outside my area of expertise. [=this question is about something I do not know much about]这个问题超出了我的专业知识范围。