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//Create memo　　与此同时，天真可爱的小灰灰跟大多数的小朋友一样，开始认识这个快乐的世界，在学习的过程中，他总是有各种各样奇怪的问题，特别的想法，让一向自以为绝顶聪明的家长——灰太狼也穷于应付。为了让小灰灰走上“正”途，灰太狼出尽法宝，一心想让小灰灰出“狼”头地。可是小灰灰却在玩乐中与小羊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.陈启无奈的摆摆手。Don't ask me the question of "how do you say when I meet MM with a new hairstyle in the morning". Just use BRIDGE to combine it yourself.29在第三季中，Spencer带着全新的形象和全新的目标归来，希望进一步巩固自己与老客户的关系，同时与更多新球员签约。