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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.板栗听了怔住，却依旧不能释然。前边又开始打仗了，这才消停几个月……板栗心中一凝：要上战场了么？他握紧了秦淼的手。In fact, when thinking about this problem, most of them are at a time when they have nothing to do. I am so busy that I have no time to think about this problem. If you don't understand, let it go. It is a kind of wisdom to let go. If you don't understand and don't put it down, you will be entangled, just like a fish that gets into layers of fishing nets, and the more you struggle, the more you can't get out.1. Motor boats shall give way to the following ships when sailing:这时，吕馨豪情万丈的说道，仿佛自己真的成了一个睥睨四方、纵横江湖的女侠。