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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:这帽子可盖的有点大了，宋义额上不禁冒汗。原来不知这书房的秘密，所以觉得他没动静，其实他已经行动了。Female journalists in red jackets become a unique scenery line at the NPC and CPPCC sessions every year.　　相传在上古时期，盘古开天地时留下一颗五彩神珠。神珠吸取天地之精华，有神奇的力量，得到了这个宝物，就可以长生不老，甚至可以统领各界，称霸世间。为了防止神珠落到坏人手里，为害世间，五彩神珠被藏在乌笼院的一处禁地中，由武林高手世代守护。几千年过去了，直到这一天，乌笼院被牵扯到一桩宝藏抢夺与武林恩怨当中。战争临近，英子借一场大火将罪责嫁祸于共产党，周静波的工作屡次受挫。与党组织失去联系的她加入189团的包扎所，等待行动，段思琪也以记者身份到189团继续监视周静波。同时，各怀心事的丫鬟杏儿、同窗乔依依、交际花邓嘉文也到189团当护士。至此，几个女人的命运紧紧纠缠在一起战争前夜，英子启动“死亡一号”的计划败露，日军又将目标锁定常德。背负“汉奸团”骂名的189团临危受命，死守常德。周静波和包扎队的姑娘们投身血战。HTTP requests typically have two characteristics: the IP address and the User Agent field. For example, malicious requests are all sent from an IP segment, so just seal the IP segment. Alternatively, their User Agent field has a feature (containing a specific word), then intercept the request with that word.