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二十年代的美国处于经济萧条时期，失业率居高不下，工人受尽压榨，成为了大机器生产中的一颗螺丝钉。查理就是一个底层市民，他在一个机器隆隆的厂房里日以继夜地工作，以赚取微薄的收入。重复繁重的工作压得他喘不过气，他把人们的鼻子当成螺丝钉来拧，卷入流水线机器的皮带里，令人哭笑不得。We can understand that the responsibility chain mode is a chain composed of processing requests. Requests are passed between these objects in turn until we encounter an object that can process it. We call these objects nodes in the chain. For example, object a sends a request to object b. If object b does not process, it will give the request to c. If object c does not process, it will give the request to d, and so on, until one object can process the request. Of course, if no object processes the request, then the request will leave the chain.Advantages: Adding a new operation is easy, because adding a new operation means adding a new visitor, and the visitor pattern centralizes the relevant behaviors into a visitor object."Yes, Common carnivores, Whether it's a dog, Wolf, or the dog teeth of lion and tiger, They are all tapered sections, With a tip in the front, But this kind of thing is different, All of their teeth are the same, All of them are inverted triangles, And very thin, Both sides are like knives, It was all 'open-edged'. It was very sharp and very hard. When I pried its mouth with a dagger at that time, after priing it open, I could find many thin but obvious scratches on the blade of the dagger in the face of the sun. The dagger I used was made of steel. It was really surprising to me that the teeth could leave such marks on it. "Zhao Mingkai said.　　郭一山为自己娶了这样一个能撑住家门的媳妇而高兴，决定让妻子识文习医，延续郭家医脉。并为之取名云鹤鸣，寓其节操如鹤、高翔长鸣之意！云鹤鸣颇有悟性，很快便掌握了郭氏祖传的正骨之术和医病秘方。尹旭道：像彭越那样，做出一个明智的决定，别怪我说的比较直白。