expertise

A high level of skill or knowledge in a particular area, gained through experience or training.

• expert/ˈɛkspɜːt/(n/adj)专家；专业的
• expertly/ˈɛkspɜːtlɪ/(adv)专业地

• technical expertise
• domain expertise
• area of expertise
• draw on expertise
• share expertise
• bring expertise

1. 1.The project required expertise in both software engineering and behavioural psychology — a rare combination.
2. 2.She brought decades of expertise to the advisory board, giving it immediate credibility with stakeholders.

• knowledge/ˈnɒlɪdʒ/— familiarity with a subject
• proficiency/prəˈfɪʃənsɪ/— high skill level
• mastery/ˈmɑːstərɪ/— great skill or knowledge

from French "expertise" = the report of an expert, from "expert" (experienced)