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Polylactic acid (PLA) is a new bio-based and renewable biodegradable material, which is made of starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, then glucose and certain strains are fermented to produce high purity lactic acid, and polylactic acid with certain molecular weight is synthesized by chemical synthesis method. It has good biodegradability, can be completely degraded by microorganisms in nature under specific conditions after use, and finally generates carbon dioxide and water without polluting the environment, which is very beneficial to environmental protection and is recognized as an environment-friendly material. This thing is actually a long piece, and then "curled up" in it and wrapped in a cylinder shape. What's the use? You will see it in a short time.　　五个身世飘零的孤儿，因爱而齐聚一堂，虽无血缘，却情比金坚。但是不管怎么说，巫的精神还是值得敬重。1949年冬天，蒋介石和毛人凤妄图在大西南苟延残喘，与新生的人民共和国相对抗，在重庆完成了震惊中外的渣滓洞、白公馆大屠杀后，秘密来到成都，向麇集在这里上万的军统特务和各路特务，布置了“密裁、破坏、潜伏、游击”四大任务。于是，当我刚刚组建的年轻的人民公安，随解放大军进入成都这座全国最后解放的一座大城市的时候，便面临着极其严峻、尖锐、激烈、复杂的铲除残匪，肃清敌特，保卫人民生命财产，保卫新生红色政权的……想的倒是好，可是狗们对主人新派的任务极不惯，套上架子后只顾挣扎，你往东窜，我往西溜，弄得驾雪橇的人手忙脚乱。