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Therefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much."Model Stealing Attack[Optional] The default virtual environment under Windows is placed in Envs under the user name, with folders such as desktop, My Documents, Downloads, etc. Change method: computer, properties, advanced system settings, environment variables, add WORKON_HOME, as shown in the figure (screenshot of windows 10 environment variable settings):小葱点头，忙请张杨张槐等人去书房里间，让红椒领着弟妹去曹氏上房歇息。After this time the mines have come into play, The company commander also ordered us to take advantage of the gap between operations. To replace the mines that have already triggered the explosion with new ones, I was one of four people on this mission, I remember when I went down there, I saw the bodies of the dogs, I can't help but look at those who were killed by steel balls but were relatively complete. There is one place I am very strange: although they were beaten by steel balls and lay there dead with holes, they had no blood at all, but there were some green things around the bullet holes, which was disgusting to look at. "第二章中，唐紫尘传下扎马步之法后，王超越是修炼，越是沉迷，然后便日以继夜的扎马步。可是……有泥鳅的时候你不要我，没泥鳅了，你还不要我……李敬文终于把眼前人跟过去串联起来，不再嬉笑，而是痛苦地揪住自己胸前衣襟，似乎有些喘不过气来。