pl形式是: classes。

The class has elected its leader .

这个班选出了他的班长。

Danny had fun with his class records .

丹尼因他们的班级记录而快乐。

Herein lies the problem culture and class .

这就是问题所在文化和阶层。

Why should the middle class encourage growth ?

为什么中产阶级应该推动经济增长