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众人的惊讶已经成为习惯，全都竖起耳朵听尹旭自己讲解。BOT is the abbreviation of Build-Operate-Transfer, which is usually literally translated as "Build-Operate-Transfer". BOT is essentially a way to invest, build and operate infrastructure. On the premise of reaching an agreement between the government and private institutions, the government issues a concession to private institutions to allow them to raise funds to build a certain infrastructure and manage and operate the facility and its corresponding products and services within a certain period of time. The Government may limit the quantity and price of public goods or services provided by the Agency, but ensure that private capital has the opportunity to make profits. The risks in the whole process are shared by the Government and private institutions. When the concession period ends, the private organization will transfer the facility to the government department as agreed, and the facility will be operated and managed by the government designated department. Therefore, the word BOT is paraphrased as "infrastructure concession.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.Group B is the same as group A;The world-famous Chinese national brand "Dowie/DoWin" has a moderate price of about 300-400 yuan.　一个受尽白眼的街头混混（陈创 饰），一个遭到排挤的转校生（郭可轩 饰），孤独失意的两人，在一系列意外中，成为了彼此唯一的朋友。然而生活给了他们不同的难题，当夏天结束的时候，他们的友情似乎也走到了尽头……明朝武宗正德年间，一盗匪乔装扮成北镇抚司指挥使翁泰北的模样从国库重地盗走十万两黄金，后被匪头白玉莲灭口，这一幕恰好被微服私逃出宫的天凤看到。白玉莲发现被人偷窥欲追杀灭口；天凤侥幸逃脱，并遇见长风镖局的少主郭旭。白玉莲手下自称浙江来的密使，持有总督派令，托长风镖局保送十万两黄金南下。此时皇上也秘密来到镖局，托镖局保护公主。原来公主身染不治之症，余日无多。翁泰北奉命也带着锦衣卫暗中随后护送。其间，天凤、翁泰北一行历尽艰险平安返回京城。皇帝论功行赏，长风镖局重振昔日雄风……