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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:下一章九点更。法政部的高级化验师高彦博学识广博，有赖于他高超的物证检验手法，屡破奇案。手下兼好友古泽琛亦是一名出色的法医，最近他准备和相恋多年的女友汀汀正准备结婚。古泽琛的好友杨逸升刚从英国回来，在一次炸弹危机中安全引爆了炸弹了，令到高彦博对他另眼相看。这时，扫毒组的高级督察马帼英和一班手下正在追查香港大毒枭戴贵，戴贵逼走了香港的另一个毒枭石头勇而独霸了整个香港市场。正当扫毒组和法证组合力追寻到戴贵的手下和国外毒贩交易，准备将得意洋洋的戴贵捉捕时，戴贵所乘坐的汽车竟然爆炸了。恰巧这时汀汀和高彦博的女友——重案组高级督察小柔经过，爆炸令汀汀死去，小柔重伤。正准备结婚的古泽琛闻之消息后悲痛欲绝。帼英调到了重案组任职，她怀疑戴贵的爆炸案是石头勇回来报复所致，于是开始着手调查。正当案情胶着时，冥冥中古泽琛似乎得到了汀汀的提示，终于找到了石头勇犯案的证据……抗战时期的上海，进步女青年韩疏影被婶婶陷害，被迫嫁给苏北大亨谢丙炎做妾室。在爱国教师历文轩的感召下，韩疏影决定逃婚投入救国行列，却因和谢家大少爷谢天赐的同学关系，被谢家大小姐谢若雪发现。飞扬跋扈的谢若雪不仅向父亲告发，还把韩疏影的‘逃婚’演绎成“私奔”，妄图置韩疏影这个“后妈”于死地。正当韩疏影命悬一线之际，谢丙炎因不愿出卖祖国被日本人枪杀。目睹一切的韩疏影深深被谢丙炎的爱国气节感动，毅然选择留在谢家，以谢夫人的名义保全了谢家老小，并在历文轩的帮助下，带着谢若雪逃到上海，用实际行动感动了谢若雪。在金戈铁马的时代背景下，韩疏影和谢若雪这两个女人不仅以“母女”的身份相依为命，也以“姐妹”的身份演绎了一段抗战救国的传奇堂下众人顿时大哗：这么快就分出真假了？更有人跌足叹息，说他输了银子了。