The structural safety class is second class, design working life is 50 years.
建筑结构安全等级二级，设计使用年限为50年。
Structural fire safety is crucial to avoiding building collapse during a severe fire.
结构火灾安全可以避免建筑物在火灾中坍塌。
The structural design of bridge safety is very important.
桥梁安全结构的设计十分重要。
The structural design of bridge safety is very important.
桥梁安全结构的设计十分重要。
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