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3. If sufficient water is available, diversion alone may be the most effective action to avoid an urgent situation, provided that such action is timely, substantial and does not create another urgent situation.Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:龙且也算是细心，一个单单靠着骁勇的战将永远难成大事。　　国民党军连长赵和在南宁战役中被俘，在他准备领了遣散的路费回家之际，四连连长唐大成却将他当做“解放战士”从俘虏营中领了出来，带到了朝鲜战场，对于四连的陈天放、苗全禄、王保全等老兵而言，赵和就是他们曾经的敌人。一场远在异国他乡的战争，改变了所有人的命运。在云山，在长津湖，在临津江……异国他乡，战火纷飞，战场的那边和这边，都是赵和的敌人，他必须背负着过往和现在，在这场战争中艰难地活下去。在枪林弹雨中，赵和和四连一起成长，赵和逐渐地认识到这支队伍是一支多么伟大的军队，而四连的战士们也逐渐接纳了赵和。停战协议生效的子夜，在和平最终到来之际，赵和和四连战士们在战线前见证了历史。The fourth and second levels do not interfere with each other.