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The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.Every time I go to the United States, I will struggle with which clothes and shoes to bring, especially shoes, which take up a lot of space. It is really difficult for me, who loves to boast, to choose between them. After I arrived in the United States this time, I couldn't find a suitable pair of shoes to match. I didn't wear them all the time. One day I went shopping with my daughter and saw a pair of shoes. I liked the brand, style and color I bought. I felt that it was a good match with that set of clothes, so I decided to buy it. When choosing the size, I chose a slightly smaller size, considering that the foot was big at the bottom of the small slope.初到琴岛，两人尝尽世情冷暖，由人中龙凤跌入社会最底层。盲打误撞，让他们与玩世不恭的混混乔小鱼结下深厚友谊，机缘巧合，两人又成为白氏企业总裁白应满爱女的救命恩人。黄卫生如愿进入白氏，却使何母急需的手术费落空。处世原则的分歧，导致昔日好友分道扬镳。何泽文脱离白氏自立门户，却成为白应满和商界败类沙鹰的眼中钉。两大枭雄的联手夹击，何母的突然离世，致使何泽文宣布破产。方薇为减轻男友的法律责任，私自承担部分过失而锒铛入狱。何泽文黯然离开商界，不知所踪。Zara和Brian过着完美的小镇生活，一个神秘的陌生人从Zara的秘密过去绑架了他们的女儿，现在他们必须竞相拯救她的生命。身处两个天界贵公子中间，加上天界和魔界的斗争，单纯的锦觅注定无法如母亲所愿安度此生……(3) Battlefield