教三 meaning in English

kyozo

Tom : but a teacher in my school is more foolish . he was in grade three last year and now he is in grade one
汤姆：可是我们学校有一个老师更笨，他去年教三年级，今年倒教一年级了。
On may 15th , the first cathedra of ms color series is ceremoniously debuted in beijing university of posts and telecommunications at 19 : 00
5月15日晚19 ： 00 ，微软色彩系列活动的首场讲座在北邮教三546隆重举办。
The first lecture of series on nov . 19 : lecture about linear algebra and computer figure was launched at teaching building room 312 at 7 : 00
11月19日，基础学科讲堂的第一次讲座：线性代数与计算机图形学于晚7 ： 00在我校教三楼312教室举行。