大学四年，我在机械工程系学习，所学的专业是金属材料及热处理。
The university is four years, I studied in the department of mechanical engineering, specialities studied are metal material and heat treatment .
大学四年，我在机械工程系学习，所学的专业是金属材料及热处理。
The university is four years, I studied in the department of mechanical engineering, specialities studied are metal material and heat treatment .
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