structural drag

例句：

1. 1. The design of the bridge has a significant impact on its structural drag.
   桥梁的设计对其结构阻力有显著影响。
2. 2.The engineers were concerned about the structural drag of the new aircraft.
   工程师们担心新型飞机的结构阻力。
3. 3. The study found that the structural drag of the aircraft was reduced by 20% through modifications.
   研究发现，通过修改，飞机的结构阻力减少了20%。