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Datetime: Date time.The event statement creates an event. Each event consists of two main parts, the first part is event schedulingBut in that case, Not even considering so many dangers, This performance of '74 spray' is of great use, I remember there were 4 '74 spray' on the position at that time, There are two recruits who operate them. Two veterans, Both veterans were squad leaders, All have the skills of air injection, Facing the big wasp descending from the pavement, The two of them were obviously forced to hurry, Take up the '74 spray' and aim at the position where the big wasp is relatively concentrated in the sky and spray it out. If it weren't for the critical situation at that time, the two squad leaders would definitely not have this kind of "dangerous operation", while the other two recruits watched the veterans take the lead and learned to do so. Although they had not received relevant training and the accuracy of spraying was not as good as that of veterans, they finally sprayed out and did not hurt themselves or other comrades in arms.　　日军派出了最为精锐的金牌特工——“毒蛇”，国民党出动了隐藏在我军内部最深的特务，而我军选派优秀的基层指挥员林峰，巧妙地打入到敌人内部，依靠群众，大智大勇，与之周旋。一时间，护宝之旅险象环生。贯穿全剧的宝藏秘密原来是个大圈套；当林峰从藏宝洞的大爆炸逃生出来后，在洞口与后赶到的“毒蛇”、国民党特务等人又是一场恶战……迪亚兹一家有七个孩子，排行中间的哈莉无疑是这个家中最没有存在感的孩子。但事实果真如此吗？她忙着照顾一大家子人的饮食起居，经常用自己的小发明解决大家庭的难题。她就像万能胶，让九口之家紧紧团结在一起。看看这个小女生是怎么撑起半边天的吧！The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows: