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The following procedure is to use the state mode to improve the light. When it comes to encapsulation, the behavior of the encapsulated object is generally preferred over the state of the object. But the opposite is true in state mode, The key to the state mode is to encapsulate each state of the thing into a separate class, and the behaviors related to this state are encapsulated inside this class, so when button is pressed, only the request needs to be delegated to the current state object in the context, and the state object will be responsible for rendering its own behaviors. At the same time, the state switching rules can be distributed in the state classes in advance, thus effectively eliminating a large number of conditional branch statements that originally existed.The main purpose is to save a state of an object, In order to restore the object at an appropriate time, I think it is more vivid to call the backup mode. Generally speaking, assuming that there are various attributes in the original class A and A, A can decide the attributes to be backed up, memo class B is used to store some internal states of A, and class C is used to store memos and can only store, not modify and other operations. Make a picture to analyze it:第三集The Flash：Season 6 -Episode 9Crisis on Infinite Earths: Part Three塔科马FD的最新负责人特里·麦康基（Terry McConky）正在接受市议会的审查，以认真对待其电台的收视率。 同时，特里（Terry）的工作人员参与进来，使他的工作陷入危险。Respiratory changes may lead to dyspnea or acceleration, or congestion caused by respiratory secretions, resulting in clicking and coughing.西元2200年, 地球合纵政府开始推行宇宙自治区建设计划, 并在西元2211年正式进入宇宙殖民时代, 西元2300年后, 人类已经建立了超过三百个宇宙自治区, 漂浮于广大的太阳系之中。几百年来，地球、月球、火星以及宇宙海盗组织已经成为了宇宙的四大势力，四方势力互相拉锯。最终，人类能否突破自身的斗争宿命，能否真正迈入历史上的新世纪呢？9. The single-person and single-pot meal distribution system is both hygienic and unique. The small pot can boil in 2-3 minutes. Compared with other brands, it is faster and saves time, greatly exerts energy efficiency, and realizes low cost and high cost suppression.