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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20世纪90年代的土耳其，一群十几岁的弃儿组成了乐队，让他们深爱的老师坠入爱河，这样她就有理由和他们呆在一起了。共尉不以为然道：父王，楚汉两国都指望不上了，但是可以援助我们临江国的可不知他们。人品对……人品……嘴上是这么说，可是范文轩心中确实有些无奈，人品之言似乎有荒诞。天圣国战神将军顾云帆率军击败北戎的入侵后，受重伤奄奄一息。皇帝想为顾家续香火下令赐婚，为救恩人性命，小狐妖夏九儿设法嫁进顾家。两人先婚后爱，经过重重波折，互相袒露真心深情表白，最终冲破人妖界限，定下白首之约。Age: 24再者，这些事，都是由长辈出面谈的，黄瓜能求长辈，又亲自跑来，足见他用心了。