Design a new outdoor fire hydrant, fire hydrants in the compound have been adopted in the multi-screw mechanism, the traditional fire hydrant to the transformation of the structure.
设计了一种新型室外消防栓，在消防栓中采用了复式螺纹机构，对传统的消防栓的结构进行了改造。
Design a new outdoor fire hydrant, fire hydrants in the compound have been adopted in the multi-screw mechanism, the traditional fire hydrant to the transformation of the structure.
设计了一种新型室外消防栓，在消防栓中采用了复式螺纹机构，对传统的消防栓的结构进行了改造。
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