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Covering theory: Covering protection effect. Flame retardants such as boric acid melt at high temperature to form a glassy protective film. On the one hand, it blocks the entry of external oxygen; On the other hand, it diffuses tissue combustible gas to the outside to achieve the covering protection effect on fibers."To live a meaningful life is to constantly give yourself new things."常规的看法，沔水似乎是一道天然的防线。The phenomenon of accelerated death of cancer patients due to surgical treatment has further aroused people's fear of cancer. Nowadays, most people do not die of cancer, but of psychological fear. Therefore, we must, like the United States, carry out a large-scale publicity that cancer is a chronic disease. First of all, by solving this psychological disease well, we can reduce the mortality rate of cancer patients in our country-after all, it is the first to save lives. Every year there are 2.2 million people with cancer in our country, and 1.6 million people are killed in a year. If each person pays 100,000 yuan for treatment, the country spends 1600 trillion yuan on cancer treatment every year. We built many magnificent hospitals in exchange for 1600 trillion and 1.6 million lives. The country pays a lot of foreign exchange to buy medical equipment for cancer treatment. Many people have lost their homes and given birth because of the treatment of cancer.几人小心翼翼地躬身，避过巡查军士的目光，顺着墙根往后面屋子少、人少的地方走去，想先看看情况再说。电影讲述的是一个经历残酷青春的少年为爱复仇不惜付出生命的故事。