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Chapter 4 Gold Standard本剧由英国“鬼才二人组”里斯·谢尔史密斯、史蒂夫·佩姆伯顿自编自演的一部英国黑暗喜剧。该剧以讽刺现实的独立故事为主要内容。We know that computers can be used for work, study, entertainment, etc. In addition to the necessary computer hardware, software is also needed. Usually, we call a computer with only hardware but no software "bare metal", which cannot do any meaningful work. At present, software can be divided into two categories according to its use: system software and application software. System software is a program designed for computer systems to efficiently use and manage computer software and hardware resources and support the operation of application software. Such as operating systems, programming languages and language processing programs, network system software, system service programs, etc. Among them, Windows operating system is what we often use. Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, office XP, Photoshop, Red Alert and so on, which we often use.该剧讲述了四个来自不同社会背景，抱有不同目的人，误打误撞走在一起，为了理想、尊严、自由和爱情，开启的一段艰辛波折、笑中带泪、励志时尚的创业之旅。In other words, their daily income is 50 rupees. In fact, as long as the hawker does not spend all the 50 rupees, he saves 5 rupees a day for the next day's purchase. Due to the compound interest effect, they only need 50 days, so they don't have to borrow the 1,000 rupees.至于我的事，你就别瞎说了，我是不会对不起你老妈的。Advantages: Adding a new operation is easy, because adding a new operation means adding a new visitor, and the visitor pattern centralizes the relevant behaviors into a visitor object.