但更重要的是这样的问题：谁应该为牙膏中发现的防冻化学材料承担法律责任。
The larger question is just who is legally responsible when a chemical used in antifreeze ends up in a tube of toothpaste.
最后，介绍了新型材料HDPE膜技术在环境卫生工程中预防冻害的应用。
At last, the paper presents application of technology of new materials HDPE file in preventing frozen damage in environmental health engineering.
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