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Visitor mode: Pay attention to the change of encapsulation object operation, support adding new operations to the class structure at runtime, and define new operations on these class instances without changing various types in the class hierarchy.What qualifications and requirements does a male kindergarten teacher need?The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:未及反应，西直门告急。尹旭与英布先一步赶到彭城，开始合围攻城，刘邦也很配合地带着五千兵马前来助战。This game has milk. Even if I overflow 1 million damage, I will drop the key characters on the opposite side in seconds, forming a situation of 5 dozen 4, instead of an AOE hitting down and making the opposite side full of holy milk.惊得他狠狠哆嗦了一下，立时坐起，侧耳倾听。