polyaminononanoic acid

例句：

1. 1. This polymer is used inthe production of plastics.
   这种聚合物用于生产塑料。
2. 2. The polyamide has excellent mechanicalproperties.
   这种聚酰胺具有优良的机械性能。
3. 3.Polymers are often used as building materialsdue to their durability and strength.
   由于其耐用性和强度，聚合物常被用作建筑材料。