2012年，其实更通俗说法，2012级；否则较别扭
我是2012级土木工程（专业）的新生。
I‘m a freshman majoring in civil engineering of Grade 2012.（推荐）
I‘m a freshman of Grade 2012 majoring in civil engineering.
I'm a civil engineering freshman of Grade 2012.
供参
I'm a freshman in the Department of Civil Engineering this year
I am a civil engineering freshman in the year 2012.
I am a freshman, majoring in civil engineering.
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