国家中至少有三种社会阶层，上层阶级（执政），中产阶级（商人，管理者）和下层阶级（农民，工人）。
States had at least three social levels, usually, an upper class of rulers, a middleclass comprised of managers and merchants, and a lower class of crop producers and agricultural laborers.
在这个历史和文化背景中，社会阶层包括上，中，劳动阶级和下层阶级。
In that historical and cultural setting, social class included upper, middle, working, and underclasses.
当一大批具备充分条件的年轻人成为社会主流的时候，一个贫困阶层的产生也在所难免，那是沉积在下层的市民。
Conditions when a large number of young people have adequate time to become the mainstream of society, also have a poor inevitable, I agree sediment in the lower reaches of the public.
而亚历山大虽然不在乎，下层阶级如何生活，但他希望同化精英阶层。
And Alexander didn't really care that much about the lower classes doing that, but he still wanted the elites.
在支系内又分为“上层亲（良亲）”、“中层亲”和“下层亲”三个不同的婚姻阶层。
Within each sub-branch, there are three different marriage ranks: high-rank marriage, mid-rank marriage, and low-rank marriage.
在支系内又分为“上层亲（良亲）”、“中层亲”和“下层亲”三个不同的婚姻阶层。
Within each sub-branch, there are three different marriage ranks: high-rank marriage, mid-rank marriage, and low-rank marriage.
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