We must strengthen the study of guidance theory, middle class, stratum dividing research with society justice and so on, if we want to make the stratum dividing research move forward deeply.
要使社会学的研究走向深入，就必须加强阶层研究的指导理论、中间阶层、社会分层与社会公平等方面的研究。
We should strengthen the study of middle class, stratum dividing research with society justice and so on, if we want to make the stratum dividing research move toward deeply.
要使社会学的研究走向深入，就必须加强中间阶层、社会分层与社会公平等方面的研究。
Secondly, the part defines some concepts, such as class, stratum, intermediate stratum, middle stratum, middle class, social resource, etc.
其次是界定了阶级与阶层、中间阶层、中产阶层与中产阶级、社会资源等概念。
We must strengthen the study of guidance theory, middle class, stratum dividing research with society justice and so on, I...
要使社会学的研究走向深入，就必须加强阶层研究的指导理论、中间阶层、社会分层与社会公平等方面的研究。
The quality of the sacred building site in the middle stratum of Tashan, Songzhe culture is very important for the study on the origin of the altar of Liangzhu culture.
塔山中层崧泽文化时期祭祀建筑遗存性质的认定，对良渚文化“祭坛”的渊源探讨具有重要价值。
Water-flooded zone identification of oil-saturated stratum is a difficult task during the middle-late period of the development, which needs an immediate solution.
油层水淹状况识别是油田开发中后期油田生产中急需解决的一个重要问题。
Water-flooded zone identification of oil-saturated stratum is a difficult task during the middle-late period of the development, which needs an immediate solution.
油层水淹状况识别是油田开发中后期油田生产中急需解决的一个重要问题。
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