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郑氏点头道：你苞谷哥哥说得对。美国一所优秀寄宿学校的一名中国学生在尝试一个从未有留学生申请过的领导职位时意识到，仅仅优秀是不够的。Collegiate a cappella group the Barden Bellas enter into an international competition that no American team has ever won.《春天的绞刑架》:讲述了杜枯荣在共产党人的引导下，在世间真善美的感染下，终走回正道的人生成长和救赎故事。杜枯荣本质善良，却在奶奶的宠溺下有些任性，因被冤入狱。在狱中遇到了共产党人梅永远，心中的善与义逐渐被他自己感受到。杜枯荣想方设法逃离监狱，希望有机会为自己的案子找到真相，也为自己过去的跋扈而赎罪。逃离看守所的杜枯荣看到万森对母亲的伤害，更怀疑自己被陷害与其有关。躲在大杂院中，开始帮助那些穷困的孩子，帮助地下党印刷进步刊物，被发现行踪后关入荒岛监狱。越狱后的杜枯荣奋起反击被抓入教化院，在那里再次遇到梅永远，梅告知自己身份后让他带着纸条逃出教化院，杜枯荣被梅永远一心为大众的精神所感，经历了心灵的洗礼，从小我走向大我，最终完成梅交代的使命，也了解自己案子的真相，惩罚了恶人，伸张了正义。Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.