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张琴、徐丽华、秦雯、周雪菲是非常要好的四姐妹，她们经常聚在一起谈理想、谈事业、谈生活，谁家有了点什么事，其他人都会鼎力相助。婚姻到底是什么？古往今来，无数智者从各个角度给出过各种答案，有人说婚姻是缘分，有人说婚姻是责任，也有人说婚姻是围城……可是生活在一起难免磕磕碰碰,而如今的世界又充满诱惑，身处婚姻中的人啊，是否真的敢确定自己始终能忠诚于婚姻，忠诚于家庭呢？无论与否，天长地久的爱情并不多见，而从一而终的婚姻却比比皆是，这其中一定包含了双方最大的爱与宽容。这里将是一面婚姻生活的镜子，家庭成员有着各自的小幸福和不安，也许您也能“照到自己的影子”，为了幸福婚姻，我们一同省视。[COMMENT 'comment']: optional, comment is used to describe event; Equivalent annotation, maximum length 64 bytes.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:这些人大都是从沛县开始跟随刘邦的部将。众少年纷纷言道，好似怕十五不让他们来一样。