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C) Initial understanding of UML. This is a tool for learning design patterns. In the early days, you could even only know the relevant diagrams of BlueJ, which took 10 minutes.Objectively Down (ODOWN for short) refers to the judgment of server offline obtained by multiple Sentinel instances after making SDOWN judgment on the same server and communicating with each other through SENTINEL is-master-down-by-addr command. (One Sentinel can ask another Sentinel if the given server is considered offline by sending the SENTINEL is-master-down-by-addr command.)4 我要去旅行　未来，随着科技的不断进步，人类医学也达到前所未有的高度。当你某个器官患有疾病时，不用担心自己会死于非命，也不必苦苦等待遥遥无期的捐赠器官，只要移植人造器官即可回归正常的生活。当然，天下没有免费的午餐，全新的器官伴随着高昂的购买金，受移植者一旦无法承担这笔费用，将面临被杀害并被夺走器官的悲惨命运。说笑嬉闹间，秦枫回来了，大家才涌入厅堂吃饭。在广告公司工作的“我”，于某次文案创意时对一女孩一见钟情，两人陷入热烈的恋情，女孩因比“我”小20岁而娇嗔地称“我”为“爸爸”。