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(3) Altering, reselling, leasing, lending or illegally transferring qualification certificates in other forms;In most languages, it is the same as annotation. The statements in this are not executed.The enhanced module pattern is used when it is suitable for those situations where the single column must be an instance of some type and some attributes or methods must be added to enhance it. For example, the following code:姊妹们急忙附和，说都想听。白杰潜入周龙贩毒集团帮助警方一举捣毁这个窝点，赢得了小娟的爱情。历经波折，四合院里一家人其乐融融。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.