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　日落2021Answer: 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.According to the implementation conditions and principles of JIT production mode, its related activities are divided into five levels, and at the same time there are different specific activity items (different enterprises are different) under each level, as shown in Figure 1.面临内忧外患，崇祯皇帝急召吴三桂入京,临危受命,北御强敌，南卫京师,但事败垂成.多尔衮利用李自成副帅刘宗敏抢夺陈圆圆，策反吴三桂，使得清军兵不血刃,长驱直入,多尔衮辅佐清廷幼君福临在北京登基，建年号为顺治元年.自与清朝结束战争(丙子胡乱)后，奴隶们纷纷想要参与正在崛起的义军队伍，希望在新王统治下，每个人可以拥有平等的社会地位，过上富足的生活。李大吉(张赫饰)身为两班贵族的儿子，爱上了自家的奴婢金惠媛(李多海饰)。而惠媛同母异父的长兄，放火烧毁了主人大吉家，并带惠媛逃走。大吉家破人亡之后，为复仇而成为抓捕奴婢的推奴手，并同时追寻惠媛兄妹。宋太河(吴智昊饰)，原本是朝鲜第一武将，剑术无人能及，被朋友陷害而沦为奴隶，后因得知世子唯一在世的幼子身处险境而逃走。逃婚的金惠媛与宋太河在途中邂逅，同甘共苦中渐渐产生了感情。而李大吉，作为全国第一的推奴手，为了5000两赏金而开始追捕宋太河。当惠媛终于知道一直追捕他们的推奴手李大吉就是当年的少爷时，他们纠结在一起的命运将如何发展……Define the interface first: