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而长大后，即将迈入四十岁的陈嘉玲，虽然一路跌跌撞撞，也是货真价实地活了大半辈子。爱过人，也被人爱过；被人负过，也负过人。就算现在一无所有，天也不会塌下来。她不知道接下来的路要怎麼走，但他告诉自己，接下来的每一天，她至在巴西的一个养牛场中，青少年因接吻传播的传染病爆发而受到恐慌。　　这一次居民会，拉开了菜奈和翔太深陷其中的恐怖杀人游戏的序幕……！Indoor fire hydrant pipe network form (ring-shaped and branch-shaped) and pipe diameter, number of fire hydrants, location and number of water pump adapters, and whether there is a roof fire water tank connected with this system.内地的治安，不属我等职责。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.