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Knowing without doing is not true knowledge. Dreams without actions are no different from nightmares. And my nightmare of improving my speech ability is two years. For 14 years, I have a strong will to improve my speech ability. For 15 years, a leader told me with his own success that I can find good rules for good speech here.踏踏实实学。The second type of attack faced by classifiers involves opponents who try to poison your data to make your system behave wrongly.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:越国故地对他们范家而言有着菲比寻常的意思，范依兰这句话算是说到点子上的故事发生在大都会之战18个月后，在那场战斗中许多建筑和市民惨遭波及。因为超人帮助人类解决了很多问题而被当做神来膜拜，但超人也因与佐德之战对城市造成的破坏而遭到逮捕和审讯，一度成为都市传说的蝙蝠侠韦恩重新出现在人们面前，他似乎正是为了惩罚超人而来。年轻的富豪莱克斯·卢瑟又在二者的矛盾中挑拨离间，神秘的戴安娜·普林斯也因自己的目的介入其中……虽说是在万军之中，但策马并骑，携美同行，别具一番幸福。