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OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.As season four begins, the Roses are making the most of life in Schitt’s Creek, and —Moira’s constant talk of escaping aside— are finally starting to feel at home in the town. Johnny is busy running the motel with Stevie as his partner. Business is booming, but it’s a challenge for him to balance work and family, while dealing with Roland’s antics. Moira is carrying out her duties with Town Council and the Jazzagals, and is also looking for new ways to utilize her talents, whether it’s through a theatrical performance, or by helping Alexis navigate event planning. David is managing his store and attempting to maintain a brand new relationship, but between struggling to find the time for romance, and overcoming the anxieties of his dating past, this is proving to be a challenge. Meanwhile, Alexis is putting all of her energy into school and her career, but is finding it difficult to focus when she still has lingering feelings for her ex-fiancé, Ted.948年初，青城发生了一起美军被刺杀案件，特调局要员俞北平（陈建斌饰）被派往青城调查此案。他深知特调局委派自己调查此案的深层目的，旨在甄别自己的身份。深陷危机的俞北平在青城见到失散多年的亲生女儿。女儿身份神秘，正在调查自己。俞北平与现任妻子的女儿徐丹妮在青城上大学，思想左倾，对父亲特务身份嗤之以鼻，正爱着一名有家室的教授，让俞北平很苦恼。俞北平一方面要完成组织最高任务，一方面小心翼翼保护着自己的两个女儿。最终，大女儿为保护他而牺牲，小女儿直到和父亲分离，才恍然明白：父亲是一名真正的共产党员。但从此两人却永隔天涯。故事始于上世纪八十年代初期，改革开放的春风已经率先吹绿了中国南方，个体经济如雨后春笋般遍地开放，家住瑞安古树村的周老顺召开家庭会议，宣布了一个石破天惊的决定：一是卖掉房子让13岁的女儿阿雨跟随表舅去意大利上学，二是他和媳妇赵银花带着16岁的儿子麦狗闯荡温州城，寻找商机发大财。他的决定断了自己也断了孩子的退路，一家人为此分隔天涯，踏上了不同的道路。女儿阿雨远赴他乡，孤身在异国打拼，历尽商海沉浮，尝尽人间冷暖，终于开创了自己的事业，在遥远的异国他乡赢得了尊重和地位。　　相传清朝末年的皇族端王，曾收敛了一大批财宝并隐藏起来，后因他得罪慈禧太后被满门抄斩，只留得一个幼女碧云格格随唱堂会的“庆生班”逃走。从此，民间和各方势力都想尽办法，欲寻获这批财宝。