low steel proportion

例句：

1. 1.The construction of the bridge is designed tomeet the low steel proportion requirements.
   这座桥梁的建设旨在满足低钢比例的要求。
2. 2. The company's new product line aims to achievea low steel proportion in its products.
   该公司的新产品线旨在实现其产品中的低钢比例。
3. 3. The design team has optimized the lowsteel proportion to reduce material usage and increaseefficiency.
   设计团队已经优化了低钢比例，以减少材料使用并提高效率。