Expertise is special skill or knowledge that is acquired by training, study, or practice. 专业技能; 专业知识
noun [抽象名词] 专长，专门技能（知识）；专家的意见
She was not an accountant and didn't have the expertise to verify all of the financial details. 她不是会计，不具有核查所有这些财政细目的专业知识。
