研究生一年级用英语如何表达？

例句：

He is now a second year graduate student in the Department of Architecture of your University.

目前他是贵校建筑系二年级研究生。

first year graduate student
研究生一年级

which year is your postgraduate study now?
博士应该是相同的。
回答的话就是 This is the first/second/fifth.... year of my postgraduate study.

Which year of graduate school are you in?
I'm a first year graduate student.
I'm in the Ph.D. program.
This is my second year in the Ph.D. program.

graduat student of grade 1

the first year of graduate student