distance between stiffening rings

例句：

1. 1. The steel beams are stiffened with steel plates to increase their strength.
   这些钢梁被钢板加固以增加其强度。
2. 2. The company is striving to improve its product quality through stiffening processes.
   该公司正努力通过强化工艺来提高产品质量。
3. 3.The new design uses stiffening techniques to make the structure more rigid.
   新设计采用了强化技术，使结构更加坚固。