社会分层的英文：
social stratification
adj. 社会的；群居的；合群的；社交的
n. 联谊会；社会聚会
A social debut.
首次进入社交界，首次演出
Slavery was once socially sanctioned.
奴隶制曾经为社会所认可。
social service facility
社会服务场所
Man is a social animal.
人是群居的动物。
She has a social nature.
她天生合群。
n. 层化，阶层的形成，成层
A temperature stratification from the top to the bottom of the plenum is obtained
从压力通迅室的顶部到底部可获得分层气流温度。
stratification in polar water normally is weak and transient
极地水域的成层性是微弱而暂时的。
"a deposit, as of ore, parallel to local stratification."
平行于局部地层的沉积物,如矿层。
Some stratification exists in the spray produced by any liquid propellant injector
由任何液体推进剂喷注器所产生的喷雾都存在某些成层现象。