flexible steel in flat section

例句：

1. 1. The new bridge is made of flexible steel in flat section, which makes it strong and durable.
   这座新桥是由平截面的可弯曲钢制成的，这使得它既坚固又耐用。
2. 2. The construction of the bridge required the use of flexible steel in flat section to ensure its stability.
   建造这座桥梁需要使用平截面的可弯曲钢来确保其稳定性。
3. 3. The design of the bridge incorporates flexible steel in flat section to optimize its load-bearing capacity.
   桥梁的设计中融入了平截面的可弯曲钢，以优化其承载能力。