tutor n 导师
the tutorial system 导师制
freshman 大一学生
sophomore 大二学生
junior 大三学生
senior 大四学生
postgraduate 研究生
undergraduate 本科生
graduate education 研究生教育
There are four grades for undergraduate.The corresponding students in four grades are freshman,sophomore,junior and senior，respectively.
本科有四个年级，四个年级对应的学生分别是大一学生、大二学生、大三学生、大四学生
In graduate education, the tutorial system is carried out，commonly.In China,the tutor have greater power over postgraduate.研究生教育普遍实施导师制，在中国，导师对研究生有较大的权力。
