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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.随后，精灵俊秀、直率豪爽的赵敏出现，周芷若、赵敏、小昭三女争艳。　　鞠县长的亲弟弟二团参谋长少剑波带兵火速援救夹皮沟，可土匪已逃之夭夭。刚才的交手，不过短短片刻，但是却让令狐冲到现在还心有余悸，这已经不是人该有的武功了。玄武王可是奉旨来追我们，一定要取我们性命的。Disk startup!Can you help me pick some and put them on my segment? "