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Sledgehammer 5.2从小哥哥背着她靠给人吹喜丧乐度日，后来还供珍珠上了艺专，可是一次意外使让珍珠不得不辍学，所以她对这个不成材的哥哥毫无怨言，每次都是倾囊相助。为此，她被歹人侮辱，被别人笑话，她求哥哥改邪归正，可是每次元宝都有一堆的理由说服她，珍珠也只能无条件地妥协。Understand asynchronous chain of responsibilityThe 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.In fact, when thinking about this problem, most of them are at a time when they have nothing to do. I am so busy that I have no time to think about this problem. If you don't understand, let it go. It is a kind of wisdom to let go. If you don't understand and don't put it down, you will be entangled, just like a fish that gets into layers of fishing nets, and the more you struggle, the more you can't get out.张良有理由相信，将来的某一天蒲俊会成为不输于其他人的，天下数一数二的名将。敬文哥，麻烦你带敬武他们几个往老村去问。