求翻译：车间为新建钢结构厂房，由一个宽24m的主跨和一个9m的辅跨、长度为156m的厂房组成。9m辅跨为局部两层结构，主跨轨顶标高为12.5m，辅跨轨顶高7.5m。是什么意思？

Workshop for new steel plant, a width of 24m main span and a 9m auxiliary cross, the plant length of 156m. The 9m auxiliary inter-local two-tier structure, the main span rail top elevation is 12.5m, auxiliary cross rail roof height 7.5m.

Workshop for the newly constructed Steel Plant, and by a wide 24 m main span and a 9m length of auxiliary cross-, plant consisting of 156 m. 9m two-tier structure for a local auxiliary Cross, the cross-track top elevation of 12.5 m, complemented by cross-track top 7.5 m high.

The workshop for the newly built steel structure workshop, extends 24m by one the main span and 9m auxiliary cross, the length is the 156m workshop is composed.9m auxiliary steps for the partial two structures, the main span axle goes against the elevation is 12.5m, auxiliary cross axle crest elevat

Workshop for new steel structure workshop, by a wide 24m of auxiliary across, the length of the main span and a 9m composed of 156m plant. 9m auxiliary TRANS-local two-tier structure, main span RL 12.5M, auxiliary cross tread 7.5m.

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