“博士”用英语是doctor。

解释：doctor 英[ˈdɒktə(r)] 美[ˈdɑ:ktə(r)]n. 博士; 医生，大夫; 神学家; 医疗设备;vt. 医疗，行医;vt. 修理，装配; 假造; 搀杂; 修改，修饰;[例句]The doctor felt his head博士摸了摸他的头。She married a Bengali doctor.她嫁给了一个孟加拉博士。He masqueraded as a doctor and fooled everyone.他冒充博士，骗过了所有人。I just decided I was a bit too frivolous to be a doctor我刚刚决定说自己有点过于轻率，不适合做博士。