中等的班级，在这种班级里有多数优秀的学生，但是又掺杂着一些成绩属于中下的学生。
我们是第四平行班，都是男孩，所以我们被解散重新排班，没有被编到别的某个班级。
We were the forth parallel class, and all boys, which is why we were the ones to be disbanded and reassigned, and not one of the other classes.
于是作者选取了自己任教的两个平行班，进行了听、说、读、写的实验研究。
So the experiment was carried out in two classes of Grade Seven to train the students' cognitive learning strategies.
研究按照准实验来设计，采用两个高中一年级的自然、平行班级作为研究对象，一个实验班，一个对照班。
The study was designed as a quasi-experiment, taking two natural classes of the first graders in a senior high school as the subjects, experimental class and control class.
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