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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.Well, that's him,In system development, some objects cannot be accessed directly due to network or other obstacles. At this time, a proxy object can be used to access the target object. Such as calling Web services in. NET.秦淼见他这样，知他是相信这两个人了。不用说，如此一来呀刘邦的象形又高大了许多，在项伯中心的印象也上升许多。1970年代，香港经济起飞，股票市场就是贪婪的战场。泰国华侨荣木桐（张兆辉饰），因父亲的悲惨遭遇，人生观彻底扭转。他由泰国潜逃香港，认识到股票市场的力量，立志成为操控者。草根正直的钱永进（萧正楠饰）与好友庄带喜（洪永城饰）、陆小虎（何远东饰），三个各有理想的年轻人，没想到被股坛风浪冲击得遍体鳞伤……永进家住进三母女，姊妹水敏晶（姚子羚饰）与水敏婷（陈滢饰）性格南辕北辙，同样等候一个可改变命运的机会。木桐成功攀附富豪唐昊峰（黄智贤饰），逐步实现人生大计，永进等人同时被牵引，命运从此改写……4. Add the function of "Collect Products for Subsequent Purchase". "Save for later" is one of Amazon's most popular features. The company will not only remind shoppers to check their saved goods through e-mail, but also display the shoppers' saved goods in their shopping carts to encourage them to place orders. This is indeed a practical function to encourage customers to make secondary shopping. You can imitate Amazon to bind this function to your shopping session with customers, or you can ask users to leave e-mail addresses to keep relevant access records. This is also a strategy for you to ask customers to leave contact information.