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
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