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葫芦哥哥，你可知道，淼淼也会使用计策了，并没有使用美人计，兵不厌诈，攻心为上。元敬言重，危难之时，总要有一心为国的将领在，不能让他们都扳倒了。The reusability of the algorithm is poor. If there are similar algorithms in other places, but the rules are different, our codes cannot be used universally.Weightlifting shoes are not all high heels, but also relatively low, similar to the height of ordinary business leather shoes, with outsole height difference of about 1-2cm.惟惟即将与稳定交往的男友步入礼堂，却在此时遇见克桓，这个男人强势又霸道地闯入惟惟的脑海，从此再也无法删除乾净。但彼此身边都有论及婚嫁的对象，他们不会是情人，甚至连当朋友都不可以！错误的相遇，擦出致命的火花。如果他们不该成为情人，也不能是朋友…那他们，该成为什麽？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.