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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.35岁，离异单身的易星言，在公司遇到了年轻的职场后辈，也是曾经的学生，周思行。年龄的差距、现实的压力、公司的制度最终都没有阻拦爱情的降临。尝试相处的过程中，有恋爱的甜蜜，也充满了种种无法忽视的差异。易星言和周思行在磨合中学习着如何更好的相爱，然而前夫出现求复合不成，不惜用卑鄙手段拆散两人，引发两人失业危机。易星言和周思行没有向现实低头，他们共同成长，携手抵抗危机，成为彼此守护的成熟伴侣。Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.如若他们嘴巴不说，却写成史书，那就坑那些人，烧那些书。该剧讲述了夏菊花极富传奇色彩的一生。夏菊花出生在一个贫穷的农民家里。5 岁时，父母为生活所迫，将她送给了马戏班的夏老板，做“压子”之女，改姓夏，忍受着非人的折磨，开始了艰辛的卖艺生涯。终于，她迎来了解放。50年代，她辗转进入了汉口“民众乐园”，从此她登上了人民的舞台。此后她更加的刻苦练功，不断钻研，最终以《顶碗》和《柔术叼花》两项绝技享誉国际杂技艺术界。夏菊花在50年代至70年代先后历任人大代表、中国杂技家协会、全国政协委员、国际杂技大赛评委等重要职务，并多次率团出国演出，为祖国争夺了荣誉，为杂技事业奉献了一生。那好，此事寡人就交给你来做。The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.