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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.In other words, all the rules we customize are the rules in these four categories, or all the rules exist in these four "tables".身背父母的期望，贫穷女牧野杉菜（井上真央饰）转入了超级贵族学校英德学院，学生们被奢侈品环绕，上下等级悬殊不说，更让本来就和同学们格格不入的杉菜郁闷的是，学院整个被F4四人组控制，道明寺司（松本润饰）、花泽类 （小栗旬饰）、西门総二郎（松田翔太饰）和美作明（阿部力饰），但凡惹到F4的人都难逃被死整的悲惨命运。某日，实在看不过去道明寺飞扬跋扈的模样，杉菜当场与其起了冲突，翌日便遭到了“红纸条”的报复，危急时刻，杉菜屡屡被花泽类救下，杉菜鼓起勇气向道明寺发起宣战，与崇拜的姐姐椿（松嶋菜々子饰）性情相似的杉菜的不屈不挠在道明寺的心中泛起了微澜，他的心不知不觉被这个如杂草般顽强的女子占据。对冲动鲁莽的道明寺无感，杉菜早已倾心于类，而类真正喜欢的却是藤堂静（佐田真由美饰），剪不断理还乱的爱恨纠葛就此展开。但这户人家看上去比之前那户人家要好，门窗都关得严严实实的。斗破苍穹第四季First of all, you should understand that when an event occurs, the event always has an event source, that is, the object that triggered the event. An event cannot be generated out of thin air, and this is the occurrence of the event.来自加利福尼亚圣巴巴拉的佩顿·霍巴特是一名出身富家的学生，他自七岁起就知道自己要成为美国总统。但是，他首先得度过最危险的政治难关：圣塞巴斯蒂安高校。为了当选学生会主席，赢得自己在哈佛的一席之地，并且坚持走自己非凡的成功之路，佩顿必须智胜那些不留情面的同学，而且还不能牺牲自己的道德和精心塑造的形象。