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4. The request action in the Context and the encapsulated behavior in the state class can easily change independently without affecting each other.In the above story, it can be seen that it is a typical publishing and subscribing mode. The seller belongs to the publisher, and Xiao Hong and Xiao Ming belong to the subscriber. Subscribe to the store. As the publisher, the seller will notify Xiao Ming and Xiao Hong in turn when the shoes arrive, and use Wang Wang and other tools to publish news to them in turn.Further: The factory method is used to process the creation of objects and delay the implementation of this creation of objects to subclasses, so that the code about the base class in the customer code is decoupled from the subclass object creation code.才上线不到一个月，Netflix就续订《#黑钱胜地# Ozark》10集的第二季。《黑钱胜地》讲述主角Marty在受到死亡威胁下，向毒贩集团表示自己可以在奥沙克湖那边进行洗钱活动，获批准后举家搬到那度假胜地去。For chronic diseases, death caused by aging is a long or short process and the last journey of life.　　邻居开心（郭可盈 饰）开了一家花茶店，无奈客人惨淡。热心的一江落力帮忙，然而开心和薛水互相吸引，成人之美的一江选择退出。谁知敏感的开心与薛水性格差异极大，反而薛水和开心的妹妹——毫无心机的美丽（廖碧儿 饰）相处起来快乐得多。开心这时也才发现，一江才是和自己最配对的人。无奈皇天最爱开玩笑，一江当年的挚爱碧芬返港了，一江开始弄不清出自己的感情……该剧讲述了各自有着无法克服的烦恼，在论坛相遇的5个妈妈之间的友情，母性，以及成长的故事。