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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.吕馨摇摇头，说道：肯定不能。皇上英明。As far as the sub-conclusions are concerned, especially the sub-conclusions (also known as keylinemessage) that directly support the main conclusion, the most important thing is to balance without bias.PX: The theory is pixels. DNF does not use pixels as the range unit, but uses centimeters with a range of 100px, which is an ellipse with a short axis of 1cm and an eccentricity of 0.95 (please see the high school math textbook for ellipse courses)国王真的是很认真，来颁布旨意了，怎么办，好尴尬。身怀异禀的护士阳子（長谷川京子饰），只要握住对方的手，便能看到对方的生命力。阳子为了拯救病人，经常偷偷地将自己的命力传给对方，帮助对方康复……