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Generally speaking, a delegate is a class that maintains a field inside and points to a method. Events can be regarded as variables of one delegate type, and multiple delegates or methods are cancelled through event registration. This article uses delegate and event execution methods to understand the difference between the two.《老来难》，语言通俗，描述细腻，道尽老年人的生活特点和万般苦痛，劝人要孝敬老人，尊重老人，并委婉告诉人们，人人都要经过老年这一阶段，孝敬老人也是尊重自己。过去，有人用这首《老来难》写出一个老人拄杖的画像，形象逼真，农村人贴在屋里，用来提醒人们的孝敬心，久传不衰。为了保证机构的专业性和高效率，朝廷的三公九卿制改革为三省六部制。According to Article 4 of the Provisions on the Composition of Total Wages:那人说道：几位该知道徐家吧？那边正是我徐家少爷和小姐，诸位给个面子吧。The second part of the classification is to find different points and expand each dimension into relevant contents. For example, ethnic groups can include Han, Hui, Gaoshan and so on. The principle here is MECE.