The social stratum structure is the core factor among all kinds of social structures.
社会阶层结构是社会的核心结构。
The design types of tunnel lining include loading structure method and stratum structure method.
隧道衬砌结构计算方法有荷载结构法和地层结构法。
The design types of tunnel lining include loading structure method and stratum structure method.
隧道衬砌结构计算方法有荷载结构法和地层结构法。
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