a man or a woman who deals with comercial stuff.
a person who works in the hospital and takes care of the patients.
a person who works in the hospital and does the surgery
a cop
其实单词用英语解释的话主要有两种:1,用意思相近的词解释,像policeman 还有一种说法是cop,比较口语化吧;2,用比较形象化的句子解释,比如 businessman,你就可以说明他是干什么的,假如是形容词的话,例如angry,你可以说out of temper
其实你平时可以多看看字典里面的翻译,慢慢地就会发现其中的门道了.