noun [集合/集体] 专家；专科医生；美国陆军专业人员（高于一等兵低于下士的军衔）
Peckham, himself a cancer specialist, is well aware of the wide variations in medical practice. 佩卡姆本人就是个癌症专家，非常清楚医疗实践中的广泛差异。
adjective [原级] 专业的；专门的；专家的
A specialist has now pronounced him fully fit. 一位专家已宣布他完全康复了。
