I need a professional to sort out my finances.我需要专业人士为我管理财务。
She is a real professional.她真内行。
The professionals played football very well.这些专业足球运动员踢得棒极了。

［派生词］ professionalism n.职业特征,职业行为,专业技巧;专业人员的特质
［同义词］ adj.  expert, well-skilled
［反义词］ adj.  unprofessional

professional可表示“有意的,故意的”,通常指在体育比赛中故意犯规。professional表示“职业的,专业的”“有意的,故意的”时,没有比较级和最高级。

用作定语
▲～+n.
 She is a professional actress.她是职业演员。
You had better get professional advice before buying stocks.你在买股票前,最好听听行家的意见。
The magician performed his tricks with professional skill.魔术师用熟练的技巧变着戏法。
The footballer made a professional foul.那位足球运动员故意犯规。
用作表语
▲S+be+～
 The arson is professional.这次放火是内行人干的。