求翻译：聚丙烯（PP）具有优良的综合性能，在日常生活中用量越来越大。但PP属于易燃材料，遇火易燃烧、且发热量高、燃烧速度快、并伴有发烟、滴落现象，容易发生火灾，给人们的生命、财产安全造成极大的威胁，这就使得其应用领域受到了极大的限制。因此，对PP的阻燃改性具有非常重要的目的和意义。性能优异的无卤阻、低烟、低毒的膨胀型阻燃剂的开发与应用已成为了21世纪PP阻燃剂最活跃的研究领域。本文综述了阻燃剂的种类、阻燃机理及未来的发展方向，着重介绍了聚丙烯膨胀型阻燃剂的阻燃机理、研究进展和发展潜力。是什么意思？

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polypropylene (PP) has an excellent, comprehensive usage in our daily lives. But PP flammable materials in a fire, burning, and easy-to-high-heat, the burning speed, and the smoke, accompanied by a drop-off in case of fire, and can be easily to life, and caused a great deal of property, and security

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Polypropylene (PP) has the fine overall performance, the amount used is more and more big in the daily life.But PP belongs to the combustible material, meets the fire inflammable, also the calorific capacity high, the rapidity of combustion quick, and is accompanied by the smoke introduction, drops