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香世仁(钟镇涛 饰)是香港富豪，他非常关心自己的宝贝儿子港生(张家辉 饰)的婚事，港生为了讨好父亲，开始追求父亲老朋友的女儿嘉嘉(卢巧音 饰)，并对嘉嘉产生真感情，俩人开始商谈结婚事宜。不料却意外遭到父亲的强烈反对，原来嘉嘉是父亲的私生女。　　《侏罗纪公园》。恐龙，恐龙，到处都是恐龙！天呐！网络世界里，真的没有俊男靓女了吗？贾丽投身于轰轰烈烈的网恋事业不能自拔。他，就是“孤独的手”……赏啥好哩？也罢，我跟葡萄姑姑说一声。Separate the abstract part from its implementation part so that they can all change independently.Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.Handle (Handle or Descriptor, referred to as Handle under Windows and Descriptor under Linux): Essentially represents a resource (such as file descriptor or socket descriptor for network programming) provided by the operating system; This resource is used to represent events one by one, which can come from both the outside and the inside. External events such as the client's connection request, the data sent by the client, etc.; Internal events such as timing events generated by the operating system. It is essentially a file descriptor, and Handle is the birthplace of events.