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　　The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.他猛咳几声，脸上出现很怪异的表情，然后连说几个靠字。丧子的家庭主妇被扫地出门后，就得变成人生黑暗的“过街老鼠”，万嘉玲（张柏芝饰）手动填满入过的坑，告诉女人们只要自立自强，就算吞过苦果也能拥有独一无二的人生信仰，但在前夫病危的时候，她又毅然承担起爱情的责任，将女人的包容和魄力集于一身。而宋乔植（吴建豪饰）在亲情与爱情的选择中迷失，面对人生的难题又何去何从，与万嘉玲的婚姻情感纠葛让人深省又感人至深。泥鳅哥哥和敬文哥都中了进士，也算遂了心愿了。解放前夕，国民党当局秘密训练了一批女特工从事敌特活动。我军在得知这一情报后，对这批女特工实施策反工作，女地下党周巧真通过军统特务们的层层考验留在了军统学校。军统学校内两名女教官为新派来的沈处长争风吃醋，明争暗斗，与学员之间也是矛盾重重。游击队利用在山中的有利条件，又通过周巧真的情报，破坏了军统的几次特务活动。军统学校内人人自危，互相猜疑，周巧真也险些被她们识破。军统特务们的种种作为，使得几名女学员心灰意冷，周巧真通过不断努力感化最终赢得几名女特工学员的信任，成功的扭转了她们的命运，使她们弃暗投明，迎着曙光走向美好的明天。At that time, The helmets worn by our army are GK80 bulletproof helmets. After understanding, I am sure that Zhang Xiaobo is wearing this model. The material used to make it is 232 bulletproof steel, which has excellent performance and has good protective effect on various high-speed flying hard objects such as fragments and rubble lifted by explosion. However, because it is a pure metal helmet, it does have the disadvantage of being sultry when fighting in hot conditions.