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First of all, the cost of obtaining customers on a large scale remains high. Although parents' awareness of online learning has improved significantly due to the market for online children's English, parents' trust in online learning still needs to be improved.After understanding the history and classification of design patterns, how should we learn design patterns? Before learning the design pattern, readers must establish a kind of consciousness, that is, the design pattern is not only a method and technology, but also an idea and a methodology. It has nothing to do with the specific language. The main purpose of learning design patterns is to establish object-oriented ideas, program to the interface as much as possible, with low coupling and high cohesion, so that the programs you design can be reused as much as possible. "Specious. Learning design patterns can better understand object-oriented ideas. Design patterns are some design skills and tricks. Don't rise to ideas and methodologies, okay?"一切好像又回到最开始的样子。14岁男孩Carey正在为第一次共舞做准备，他的爸妈很好奇舞伴是哪个女孩，但最后他们发现Carey的舞伴也是男孩……This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.安迪（尼克·赫尔姆 Nick Helm 饰）对外一向自称是一名自由音乐人，但实际上，年过三十的他每天都过着无所事事的无聊生活。这样的日子久了，在未来中看不到一丝希望的安迪心生倦意，他决定自杀，甚至写好了遗书。就在这个关键时刻，姐姐的一通电话打乱了安迪原定的“计划”，在电话中，姐姐希望安迪能帮她照顾他年仅12岁的小侄子艾罗尔（埃利奥特·斯佩勒-吉洛特 Elliot Speller-Gillott 饰）。今天冲四更，让我们一起努力吧。