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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:希什（威尔•史密斯 Will Smith 饰）十分准确的把握了男性的弱点：他们在求爱的时候由于过分迫切想得到对方好感，反而会表现笨拙失去魅力。而希什掌握了一套完整的独家的理论，可以帮助男士在头三次约会时候就成功俘获对方的心，这套谋略全面实用，令约会期间的就餐、牵手、接吻，有了指导细则。My friend, although I am not a pilot, I almost flew into the blue sky at the beginning. I solemnly advise you not to expect any "customs clearance skills"! Flying is no laughing matter. We must be practical and realistic in terms of physical examination. If we can't, we can't! Even if you muddle through with some measures, you will eventually reap the consequences. The risk of flying is very high. If you lose your life due to an accident in the sky due to your physical condition, do you think it is cost-effective?承接第一部剧情，一群食肉老鼠通过水管道再次来袭，恐怖鼠患围攻家园。No.28 Tang YixinI think it's time to do itSystem Launcher, screen lock key, caller ID and other system applications