major in

汉语翻译

例句：

1. Mr.Lee said he would major in history and he means business.
   李先生说他要专攻历史，他是决心认真干的。
2. I major in engineering, but this machine is hard to handle.
   虽然我学的是机电专业，但这机器还是很难修。
3. She majors in history.
   她主修历史。
4. I major in science.
   我主修自然科学。