To attach the preparatory to the senior school these three classes were known officially, on speech days and in reports, as upper, middle, and lower second.
作为高中的预备班，在演讲日和报告中，这三个班被正式称为上、中、下二班。
2
In terms of class, digital divide exists among different types of workers and between the upper and middleclasses and the lower class.
在阶级方面，不同类型的工作者，以及中上层阶级和下层阶级之间，都存在着数字鸿沟。
3
In that era you also had your upper-middle class and your lower-upper class and off on the side were the collar classes, white and blue.