这些塑料瓶是由聚乙烯制成的，可以回收利用。

These plastic bottles are made of ___polyethylene and can be recycled.

超市购物袋通常由聚乙烯制成，因为它们既轻便又耐用。

Supermarket shopping bags are usually made of ___polyethylene because they're lightweight and durable.

这种手术器械的把手是用聚乙烯材料制成的，既轻便又耐用。

The handle of this surgical instrument is made of ___polyethylene, making it both lightweight and durable.