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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.而副将何风，英勇善战，斩杀敌将阿图，率领毫无战力的新军反败为胜，杀敌数百，被记一大功。No.1 "Wild Ball Boxing": The damage energy ratio is 214.2. Everyone knows that this is actually hanging, which is not in the same style as other skills. To tell the truth, many players don't like to use it and feel that it damages the game experience, but in fact it is quite cool to use this trick to clean up BOSS.世人都晓得人参是好东西，也就我们做大夫的才明白：那东西再好，也是药，当不得饭吃。Phase B Metering Section　CBS电视台宣布，他们将启动《星际迷航》（Star Trek）电视剧项目，这套全新剧集拟定2017年1月开播。