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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.在战场上只是听说赵王歇等人逃走了，不知道具体情况到底如何，又是逃到哪里去了呢？是否已经出于安全的环境之中了。(6) Key Position: The attacker uses his body to block the defender behind him and occupies a favorable catching position.蝉儿妹妹，昨晚我娘说我了，说我不如你。Picture above first.这会子只能坐在这里喝闷酒。尹旭听到这里不由的一阵激动，巴蜀之谋将会更加便利…… show_style();。