specialist

/ˈspɛʃəlɪst/

an expert who is devoted to one occupation or branch of learning

中文释义：专家；专科医生

She consulted a heart specialist about her chest pain.

她就胸痛问题咨询了一位心脏专家。

The company hired a marketing specialist to boost sales.

公司聘请了一位营销专家来提升销售额。