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尹旭嘿嘿一笑，心中暗叹：有几年的时间已经完全足够了，要是还不能有所成就，那一切的志向就完全是白日做梦了。这太可怕了，还好老子结婚了。大学某男生宿舍，从技术宅男到英俊校草，性格相投躁动捣蛋的五个人成为死党。青春无畏死党团让系辅导老师大为光火，隔三差五的某个死党团团员就会做出在学校做出惊人之举，示众教育是家常便饭。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 Source class is a decorated class, and the Decorator class is a decorated class. You can dynamically add some functions to the Source class. The code is as follows: