The wheel would need to withstand immense and constantly changing stresses as it rotated, so to make the structure more robust, the steel sections were bolted rather than welded together.
轮子旋转时需要承受巨大的和不断变化的压力，所以要使结构更坚固，钢的部分要用螺栓连接，而不是焊接在一起。
The company has a variety of specifications for steel sections and aluminum models.
本公司拥有各种规格型号塑钢型材和铝型材。
The roof is formed from standard steel sections and recyclable pre-cast concrete units.
展馆屋顶是由标准钢构件和可循环预制混凝土单元构成。
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