👉 Prestressed refers to a type of material that has been strengthened or reinforced by adding additional layers of reinforcement, such as steel or混凝土，使材料更加坚固或增强。
👉 Prestressed refers to a type of material that has been strengthened or reinforced by adding additional layers of reinforcement, such as steel or混凝土，使材料更加坚固或增强。
