Tied in with the objectives system is the class system.

“目标”系统关联着“职业”系统。

youdao

Their structured class system included chiefs, priests, physicians, and commoners.

他们的部落阶级分为酋长、祭司、巫师及平民。

youdao

I've added a small class system because robust HTML5 applications need structure and good organization to maintain.

我已经加入了一个小型的类系统，因为结构化和易维护的组织形式对于健壮的HTML5应用是必不可少的。

youdao

President Obama said the current system has led the country to a breaking point, imposing hardships on middle-class Americans who struggle to pay for health care, who are unable to obtain it.

VOA: standard.2009.09.10

Because it challenged the whole class system, that people are born into a certain place and cannot-- and should not-- be moved.

因为它挑战了整个阶级体系，人生来就有阶级，不能-,也不应该被改变。

哈佛公开课 - 幸福课课程节选

I think that there's definitely a class system, but I also feel like everyone is very accessible,

我觉得，毫无疑问，这是种阶层系统，但我也感觉何种人都很容易接触到。

美国贫富差距？ - SpeakingMax英语口语达人

It's been clear since the 1970s that the class system was becoming more inflexible.

BBC: Class calculator: A US view of the class system

But it does reinforce a fear: is America beginning to develop more of a class system?

ECONOMIST: America's great sorting out

The assumption was that England's class system would prove to be the main determinant of their future.

WSJ: Film Review: Life, Not by the Numbers by Joe Morgenstern