如果是去外企面试或者申请留学，可以说： I was graduated from?XX?university,my major is Mechanic Engineering.
如果就在国内，就说：I was graduated from?XX?university,my major is Machanic Engineering and Automatical.
mechanic 英 [mk?n?k]美 [mk?n?k]?
n. 技工，机修工
adj. 手工的
n. (Mechanic)人名；(英)梅凯尼克
engineering 英?[end'nr]美?['?nd'n?r]?
n. 工程，工程学
v. 设计；管理（engineer的ing形式）；建造
扩展资料例句：
1、Familiar with product features and technologies for forging, casting and mechanic engineering .
熟悉铸造、锻造及机械加工的产品特点和工艺。
2、Combining the mechanic engineering with soil mechanics, the paper studies the dynamic characteristics of interaction between the compaction equipment and soil, dynamic model is set up.?
将机械工程和土壤力学有机结合，对压实机—土壤系统动态特性进行研究建立了系统的动力学模型。