大三的英文：
junior

He is my senior by three years.
他比我大三岁。

I hear Xiao Li is head over heels in love with an old man who is 30years older than her, love is really a mystery.
听说小丽爱上一个比她大三十岁的老头子。爱情这个东西真难琢磨。

His cake is three times bigger than mine.
他的蛋糕比我的大三倍。

Some people are talking about the international situation in terms of a big triangle.
世界上的人在议论国际局势的大三角。

People around the world are talking about the big triangle composed of the Soviet Union, the United States and China.
世界上都在说苏、美、中“大三角”。

A large three - headed muscle running along the back of the upper arm and serving to extend the forearm.
肱三头肌位于上臂背面的大三头肌，用于伸展前臂

So come into mcdonald’s and enjoy a big Mac Sandwich.
请走进麦当劳快餐厅来享受一个麦当劳大三明治。

There are lots of jobs in junior grades.
初级阶段有很多工作要做。

junior sports development
青少年体育发展

There are separate rooms for senior and junior officers.
高级军官和下级军官的房间是分着的.

He left college in his junior year.
他是在大学三年级时辍学的。

Generally speaking, the female is not junior to the male in wisdom.
一般说来，女孩子和男孩子一样聪明。