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Is to create a factory class to create instances of some classes that implement the same interface. First, look at the following diagram:信中，胡宗宪痛斥罗龙文、严世藩卖国之举，借机表明徽王府一个大明的坚决立场，至于其中痛骂严世藩言辞之正义，讨好嘉靖言语之媚气，不必多言。2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.时间长了，消耗和破坏是难以承受的，任谁也不想为了一场胜利，将一个国家拼的国将不国，空虚乏力。Catalytic dehydration theory: mainly refers to changing the thermal cracking process of fibers to dehydrate and prevent the generation of combustible substances.《爆笑悲剧王：笑着笑着就哭了》是一档全新日本喜剧脱口秀节目，由人气的资深喜剧二人组千鸟主持。Weightlifting