expertise
n[U]
expert knowledge or skill, esp in a particular field 专门知识或技能(尤指在某一领域)
Customers will be impressed by the expertise of our highly trained employees. 我们的雇员专业性强、 训练有素, 保证顾客满意.
We were amazed at his expertise on the ski slopes. 他斜坡滑雪的技能使我们赞叹不已.