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OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.农民出身的陶艺师吴国庆在瓷都景德镇经过几年的奋斗，物质生活与城里人相比，已不相上下，他和妻子商定把在乡下读书的女儿吴小田接到城里。为避免孩子受到歧视，老师和家长善意隐瞒了她从农村来的真相。这样做反而给年幼的小田增加了心理负担。正当他们不知如何应对这事的时候，朝廷来了旨意：将张家全家流放北地。众人听得不住点头，都觉得这话分析的不偏不倚，在情在理。The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.把前世所有的盼望开成了花，等你走近，即使你可能会无视。