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掌柜的便命人抬了一张圆几过来，按香云要求，摆了两小碟羊肉，并两碗羊汤，慢慢喝着。For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.周小北、王媛、韩文静三人是大学同学兼闺蜜，毕业后同在一个城市工作、生活。生于传统家庭的周小北，在与相恋多年的男友樊斌结婚后，发现婚后生活并没有想象中的那么如意，经历了一系列的变故二人离婚。最终她与暗恋自己多年的李理走到了一起。王媛出身贫困，但凭借自立自强、努力拼搏，最终成为都市白领，改变了整个家庭的窘境。在经历过感情的起起落落后，她终于接受了对她默默付出的胖子的爱情。家庭条件优越的韩文静，经营着一间工作室。在经历了感情生活的分分合合后，遇见了医生成晓峰，千方百计追到手后，经过无数磨砺，与之终成眷属。历尽一系列波折，三个女青年相互鼓励、相互安慰，三人因为生活的磨砺逐渐变得成熟，社会角色和人生方向也在迷途后更加清晰。Connection conn = null;As for what kind of lineup to play the old one and the second, I will not be Amway. There are all kinds of lineup, and there are also those who have played the dragon blood millstone alone.闻言，青年顿时嘴巴张大，一脸不可思议。