A student is a person who is studying at a school, college, university, etc. * student 指在校学习的学生。
An undergraduate is a student who is studying for their first degree at a university or college. * undergraduate 指大学里攻读学士学位的学生。
In BrE, a graduate is a person who has completed a first degree at a university or college. In NAmEgraduate is usually used with another noun and can also apply to a person who has finished high school.在英式英语中，graduate 指大学本科毕业生。在美式英语中，graduate 通常与另一名词连用，亦可指中学毕业生：◆a high school graduate中学毕业生◆a graduate student研究生
A postgraduate is a person who has finished a first degree and is doing advanced study or research. This is the usual term in BrE, but it is formal in NAmE and graduate student is usually used instead. * postgraduate 指研究生，在英式英语中为常用词，在美式英语中则为正式用语，通常用 graduate student 取代。