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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.3. SingleTaskDeliberately practicing and developing skills are skills that others have come up with how to improve and skills that already have a set of effective training methods.　　●我最烦你们这些打劫的，一点技术含量都没有！ 大哥。稍等一会，我要劫个色。●你比傻根还傻！小葱逐一打量他们，与秦淼描述的各人对照，发现少了四五个。动荡岁月的一曲挽歌 共产党引蛇出洞剿灭各路匪首1949年，桂林白崇禧公馆，各路匪首，垂死挣扎，叫嚷要实行蒋介石的“应变计划”。并将大瑶山和十万大山等地作为反共游击根据地，白崇禧所器重的匪一二六军军长林秀山被赠与了一包上等的烟土。与此同时，我南下部队进入广西，军区领导人张云逸、莫文骅、李天佑感慨风云变幻，20年打了个来回。林匪在撤进山里前，对万山县进行了空前洗劫，炸毁了县城，并强迫乡民进山当匪。许负看着孩子的面庞，嘴角露出一丝意味深长的笑容。