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In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:Syfy超自然动作剧《Ghost Wars》联合Nomadic Pictures共同制作。Vincent DOnofrio、Kim Coates、Avan Jogia、Kristin Lehman和Meatloaf将出演13集的首季。本剧背景设置在一个超自然力量泛滥 的偏远的阿拉斯加哦小镇，讲述了当地的流浪者Roman Mercer（Jogia饰）需要忍受小镇上的歧视和自己内心的魔鬼，学会驾驭潜藏在他身体里的超自然力量，将小镇从阴魂不散而且对当地人生活造成极大威胁的超自然能量中拯救出来。杰克·怀特霍尔邀请他臭名昭著的闷闷不乐的父亲在伦敦西区的舞台上参加一场圣诞喜剧盛会，并邀请名人嘉宾出席。某晚，一辆运送文物的卡车发生车祸，内中昭陵六骏之一的唐三彩“飒露紫”失窃，引起国内外极大关注。在此之后，热爱攀岩的电视台女主持夏梅（陈慧琳 饰）被派到英国伦敦参加某拍卖行的活动，借机调查“飒露紫”的下落。谁知在会场她的隐形耳机信号和警官张浩（郑伊健 饰）的耳机信号相冲突，以致于暗访行动以失败告终。在此之后，张浩主动登门拜访，告知神秘狡猾的国际大盗九尾狐（梁家辉 饰）很可能将“飒露紫”锁定为下一个偷盗目标。从暗访录像中，他们果然也看到一个疑似九尾狐的身影出现。　　本片荣获2005年DVD Exclusive最佳摄影奖。Central focus metering: It is a traditional metering method, which pays attention to about 2/3 of the position in the center of the picture. The advantage of this metering method is that it is easier to control the effect.