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For example, the above Liezi, Xiao Ming and Xiao Hong do not need to visit Taobao every day to see if the shoes have arrived. At the right time, when the publisher (seller) arrives, they will notify the subscriber (Xiao Hong, Xiao Ming and others).　　美国西海岸出现了原因不明的大规模停电，食品供应陷入危机。哎……女子拿出手帕，轻轻擦拭着和尚脸上的汗液，你不是说，张经一走。大叔随着食堂的夜晚一起经历人来人往，满足食客们的味蕾，也见证了各式人生。而无论夜多深、路多远，大叔还会在食堂里继续倾 听大家的故事。(1) Special Hardware在泰国曼谷大都会，有五个充满梦想和热情的年轻小伙子同住在一起，但是这个房子只有一个卫生间，五个男生都是不同的职业有着不同的梦想，在这屋子里发生了一系列的爱情故事。IGMP means Internet Group Management Protocol. This protocol is used to establish and maintain multicast group membership between IP host and its directly adjacent multicast routers, but does not include the dissemination and maintenance of group membership information between multicast routers. This part of the work is completed by each group of broadcast routing protocols. All hosts participating in multicast must implement IGMP.