1、senior class：高年级（或四年级）；长辈

2、senior maths class 高中数学课堂

3、senior English class teaching 农村高中英语课堂教学

4、senior politics class 高中思想政治课

5、[例句]他们还对这个学区的高等数学项目提供鼎力支持，这一项目曾经丛四年级开始，但现在将从六年级开始。They have been huge supporters of the districts advanced mathematics program, which once began in the senior class but will now start in the sixth.