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In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:林聪一时没防备，吓了一跳。该剧改编自英国著名科幻小说家道格拉斯·亚当斯的同名系列小说。主角怪探德克，常常通过剖析事物之间基本的内在联系来破案。伊利亚·伍德饰演德克的助手托德。他出的计，也近是当世第一毒计。A2. 1.9 Abdominal examination.一对儿杀手，肯与雷（Colin Farrell 饰），在圣诞期间来到比利时古城布鲁日，他们将在这里接到联系人哈里（Ralph Fiennes 饰）指令的新任务。雷在不久前的一次暗杀中误杀了一名男童，怀着深深愧疚的雷情绪不稳，古城中的等待对他来说是一场难耐的煎熬。肯作为带领雷入行的前辈，试图帮助雷摆脱困境，但他的努力毫无收效。百无聊赖的雷在街上结识了女演员克洛伊，这个神秘女孩引发了雷一系列的冒险经历，与此同时，肯再一次被哈里催促，原来此次任务的真相是暴怒的哈里要雷为他的误杀行为付出代价，肯面对被自己一手引入杀手行当的年轻人，难以做出抉择，两名杀手，在夜色中的古城各怀心事…… 本片获2009年英国学院奖最佳剧本奖等多项褒奖。