1、a member of the working class (not necessarily employed)
工人階級(jí)的成員（不是必需的雇員）。

2、A quarter of the working class voted for him.
1/4的工人階級(jí)給他投了票。

3、a member of the working class (not necessarily employed).
工人階級(jí)的成員（不是必需的雇員）。

4、It is the working class that is most selfless.
工人階級(jí)最大公無私。