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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.其二则是为了自身学业，准备入青山书院求学。东南亚某国一家华人医院内，该院董事长英玉华今日手术，主刀医生是他的好友欧阳山敬，未料英突然猝死。欧阳山敬深感蹊跷，潜入验尸房，化验结果令他惊讶愤怒。他拿来起电话，却遭一击，血流满地倒在地上……，在一所疗养院内，英见到已变成痴呆的欧阳山敬和他女儿文惠。英纯良、文惠、职紫、“马花探”卷入此案调查，发现，尚未获国际安全药检的KEER，有极大可能正在该院被偷偷进行实验，巨大潜在商业价值使用权幕后黑手们疯狂铤而走险，一个巨大“白色陷阱”若隐若现…位于巴蜀一带的江城，自古多雨多雾，阴气极重，流传着数不清的传说异事，尤以“入城多梦”为奇。因此，江城也比别处多了一个职业—一解梦师专靠解梦来预测吉凶、推算祸福。民国初年，“解梦师”袁不解凭借玄妙的“解梦术”，利用人的潜意识破解是案;更与警局众人结成搭档，将古老的梦缘解释与现代的刑侦技术精妙结合，一同在连环诡异的梦境和危机四伏的现实中寻找悬案背后的真相。Information Technology4 Easily implement revocation and redo of requestsHow to learn efficiently? I think we need good methods, insist on deliberate practice, ensure sufficient intensity, and effective coaches to provide feedback for learning. This "Deliberate Practice" provides you with effective guidelines.