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When the blower was blowing for an instant, Huang Weiping felt nervous. "It's like someone pinching his neck. You are suffocating and can't remember anything in your mind. At that time, your reaction was nervous and you couldn't even think."唐家霸王枪，对夺命书生剑，一触即发。房间中，陈启脸上有些疲惫，但是精神却十分兴奋，看着电脑屏幕上密密麻麻的文字，他露出满意的笑容。Ctrl + K: hyperlink《玻钻之争》，又名《新凤凰血》，由颂恩·宋帕山和婉娜拉·宋提查主演，于2008年在泰国5台播出。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.