poly high frequency therapy unit

例句：

1. 1. Polymers are materials that can be molded into various shapes.
   聚合物是能够被塑形成各种形状的材料。
2. 2.The polycarbonate plastic is used in the production of safety glasses.
   聚碳酸酯塑料用于生产安全眼镜。
3. 3. Polystyrene is a type of synthetic resin that is commonly used for packaging.
   聚苯乙烯是一种常用的合成树脂，常用于包装。