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3) Verify that docker works properly [Network Needs Guarantee]Defines a one-to-many dependency relationship between objects. When the state of an object changes, all objects that depend on it are notified and automatically updated.(Lin Shucheng, Vice Chairman of Sichuan Provincial Committee of the Chinese People's Political Consultative Conference and Secretary of Liangshan State Committee)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.在这间骏河湾一隅的小小高中里面，以2年级的高海千歌为中心的9名少女，怀抱著远大的梦想挺身而出。Adults can also develop perfect pitch//246一个人从他身边跑过去，撞到他身上，差点没有把他撞倒。