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1. Columns of command mode自从安山集团的社畜喻星垂从天上接了馅饼，继承了姑妈价值千万的遗产房，就误打误撞地自己老板柳予安成为了邻居。从此，二人便开启了啼笑皆非的邻居生活。朴珍荣剧中饰演柔美（金高银饰）的男朋友刘巴比一角，内在外在都很完美，是个完美男人。生来乍到的，咱得小心些。　　In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.影片讲述了几位来自不同家庭环境、不同性格的同班同学，在学习和生活上遇到困难时，互相帮助、互相鼓励、共同成长的故事。