done with, having or involving great knowledge or skill专业的；熟悉的；内行的；知识丰富的；经验丰富的◆to seek expert advice/help寻求专业谘询／帮助◆I need an expert opinion on this.关于这个问题我需要内行的意见。◆We are expert at planning and running corporate events.我们在计划和承办企业活动方面十分内行。