drag reduction by polymer

例句：

1. 1.The use of polymers in the construction industry has significantly reduced the amount of drag caused by heavy machinery.
   在建筑行业中使用聚合物显著减少了重型机械造成的拖拽。
2. 2. The researchers found that the addition of a small amount of polymer could greatly reduce the friction between themoving parts.
   研究人员发现，添加少量聚合物可以大大减少移动部件之间的摩擦。
3. 3.The new material is designed to minimize drag during flight, which can save fuel and reduce emissions.
   这种新材料的设计旨在最小化飞行过程中的拖拽，从而节省燃料并减少排放。