其他的回答已经很全面了。. 这里特别说一下,千万不要用Dr. Firstname或Prof. First name 开头。. 这是一种调侃式的说法,比如你好哥们刚拿phd你可以doctor叫他叫着玩。. 要么用 prof. Last name, 要么直接叫firstname. 称号加firstname是绝对不允许的. 之前跟教授发邮件这么写 ... More @Wikipedia
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