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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.屠龙刀现世，谢逊夺到宝刀，藏身海外孤岛，于是江湖豪客闻风而动，为寻屠龙刀，争斗不止。对于郑和的了解，他也许比面前这位还要更多。With the improvement of training methods and the achievement of human beings to a completely new height, in any industry or field where human beings make efforts, more outstanding methods are continuously appearing to raise the "threshold" that people think can be achieved. Moreover, there is no sign that such "threshold" will not be raised any more. Whenever human beings develop to a new generation, the boundaries of potential also expand and increase.The future third daughter-in-law张良倒是有心劝谏，确实完全没有机会，即便是说了，此时唯我独尊的汉王哪里能听得进入。