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The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:《BiteSisters》讲述了可以将各种风格转化为自身魅力、看到不义之事就无法忍受的韩伊娜(姜汉娜饰)，在一瞬间成为了粉丝百万的网络红人，无意中偷偷帮助那些需要帮助的人，是一部甜蜜奇幻剧。多年之后，身为越国开国功臣明远侯高易回想起这段往事，总是jī动的涕泪纵横。The birthday note shows eight Arabic numerals to match your birthday.申优铉（南优铉 饰）从小和奶奶一起过着相依为命的生活，善良正直的他心怀着音乐梦想，在女生之中大受欢迎，然而，童年时代的灰暗回忆令他在内心里筑起了厚厚的壁垒，容不得半点的入侵。申优铉的家中新来了一位名叫李瑟菲（金赛纶 饰）的寄宿生，这个身世不明的神秘女孩很快便吸引了申优铉的注意。原来，李瑟菲本事神界的天使，因为一场意外事故而被贬至人间，在天堂高中里，她一边隐藏起真实的身份，一边寻找着重新变回天使的方法。随着时间的推移，申优铉和李瑟菲之间的距离渐渐拉近，两人之间产生了真挚的感情，然而，身为天使的李瑟菲怎么能够与人类相恋？在天堂和人间之中，李瑟菲会做出怎样的选择？正好公府也在大肆布置，比昨日元宵更显喜庆热闹，因此，众人就在朱雀大街公府附近游玩。　Elizabeth Thatcher, a young school teacher from a wealthy Eastern family, migrates from the big city to teach school in a small coal mining town in the west.