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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:既然如此，索性还不做无畏的抵抗最好。《音乐周刊》为新闻杂志类融媒体节目，节目设计充满科技感，节目既有新闻又有专题，既有传统电视手法，又有Vlog等大量短视频内容。众人止笑，定睛一瞧：可不是么，黄瓜长得像娘，而刘蝉儿长得也像姑姑，两人站一块，还真有五六分相像，尤其是那双杏眼，更像了七八分。1973年，某部队通信连里，班长韩琳、新兵姜士安、张雁南在一起学习、生活。出身贫苦的农村兵姜士安在生活上受到了韩琳细致入微的关心，这使他渐渐喜欢上了善良、漂亮的韩琳。从小就娇生惯养的张雁南也在韩琳的帮助下不断的提高着自己的能力。而韩琳在努力学习、刻苦工作的同时对英俊、潇洒的军宣队队员彭湛渐生好感……在最后一集中，南将饰演拥有地下偶像容颜的女高中生有村美笑。美笑一个人作词作曲，想追求自己真正喜欢的音乐。偶像的活动和将来的事等，烦恼的时候看「三坪房间的钢琴师」的视频被鼓励，不过，有一天，美笑的评语，意外地被回复……这样的展开。