There is greater safety factor in welded structures design if 3.0 applied.
选取3.0进行结构设计具有较高的安全系数；
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 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。
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