major in

1.She majored in Maths and Physics at university.

她在大学里修数学和物理。

2.Mr. Stone spent his undergraduate days in Columbia University, majoring in economics.

斯在哥伦比亚大学度过了他四年的大学活, 修经济学。

3.Now our company is majorclass="key">ing in nuts series: rivet nuts, blind rivet, insert nuts,nylon locknuts, welded nuts, flange nuts and other kinds of auto standard parts.

上海锐拓五金现在营紧固件系列中的螺母产品： 铆螺母，尼龙锁紧螺母，焊接螺母，法兰螺母，以汽车标准件。