Plastic bags and plastic packaging made partly from post consumer materials were heralded as forward thinking technology at the time of their arrival.

胶袋及塑料包装作出了部分从后消费材料被誉为前瞻性思考技术的时候，他们的到来。

youdao

Migration of chemical substances from plastic packaging materials into foods has been widely concerned which may contaminate foods and finally endanger people's health.

塑料包装材料内含化学物向食品的迁移会造成食品污染并最终危害消费者的健康，近年来受到国内外广泛关注。

youdao

However, the main structure of plastic flexible packaging materials are plastic polymers, has some permeability to gas, and therefore can not fully replace the metal and glass packaging.

然而塑料软包装材料主体结构是塑料聚合物，对气体有一定的渗透性，因此并不能完全代替金属、玻璃包装。

youdao

The price of raw materials wheat, cheese, meat and even the plastic resin used in packaging has trended higher in recent years, reflecting new claims on the global food supply from fast-growing emerging economies.

FORBES: Green Giant And Betty Crocker Can't Risk Raising Prices