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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.4. After completing the selection stage, the players will immediately enter the preparation stage in the game scene. This stage cannot cause damage to other players. All players will be distributed in multiple areas in the scene. In this stage, the players can know in advance and discuss with their teammates the tactics and strategies of the birth selection stage.OnCreat () onStart () onResume () onPause () onStop () onDestroy ()延续第一季的故事电视连续剧《天地情缘》，以回归前的香港为背景，讲述了大陆的三个姑娘孟晶晶，邱春慧和李梅来到香港后的经历，更通过她们各自坎坷、曲折，甚至是充满传奇色的遭遇，构成了一幅具有强烈戏剧冲突的人生画卷，生动地表现了香港和祖国内地由于百年分离所形成的社会矛盾，文化差异和人性冲突还通过三位内地姑娘与香港阔少黎少雄，北京青年田兵，香港平民黄德安，许世发等人之间的感情纠葛，反映了炎黄子孙血脉相连的情缘就像天地相依一样是无法割断的。M=f (C, S, A, U, E, a)