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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.他们在神殿中发现一个战斗陀螺“索布莱兹”。“白色之心，带着天马之翼打开新时代的大门……这是我们亚特兰蒂斯的传说，创造的时刻已经到来。用它的力量建设我们新的乌托邦。”遵从领袖巴基姆的话，少年海利奥斯拿起了索布莱兹。Finally, the test:吕馨和陈启一样已经老了，满头银发，脸上布满皱纹，但是她的目光一如当年初见时那般温柔。闻名中外，曾担任美国赌场保安总顾问的魔术手石一坚，终回流澳门退休，更宴请各方朋友到来庆祝生日宴。其中好友Benz哥与他的儿子晒冷以及外甥牛必胜，更特别由香港来到澳门到贺。翌日，中国、香港以及澳门三地警方，竟不相约而同找上石一坚，希望他能够重出江湖帮忙对付DOA组织集团的高先生，但坚却以退休为由婉拒了事。 　另一边厢，冷竟与牛必胜一起找上门，希望坚收他俩为徙弟，坚哥虽欣赏小冷，但奈何经已退休，只好拒绝，但看在Benz哥份上，就招待他一夜。谁不知，当晚竟遇上了杀手，杀手们不问原因直接追击小冷以及坚哥爱女阿彩。期间虽有中国公安洛欣相救，但阿彩终难逃一劫，被害至失忆。 　明查暗访下才知道，幕后的黑手竟是高先生。事情又岂会是无缘无故发生，坚与小冷二人连手，加上女公安洛欣三人，布下奇谋妙计对付高先生，斗智斗力，誓要查个水落石出，将他绳之于法燕南天一声怒吼，那把生锈的铁剑已然出鞘。In an interview with Kaggle, he shared his experience in participating in the competition and also talked about many combat experiences in machine learning competitions. Quantum bits are transported here. The following is the translation of the interview: