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The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:某维和地区，维和警察执行护送各国人员去往机场的路上突遇恐怖分子袭击，炸毁了道路，中国维和警察不得不带领众人前往密林逃生，美国无国界医生雷娜.当地向导李大石和随队工程师特拉法在逃生路上听到恐怖的象冢传说都惴惴不安，在李大石错误的引导下，众人陷入更大危机，导致内部矛盾不断，中国维和警察不得不解决内忧外患的危机情况。在一路被追杀的他过程渐渐发现，这一行人的身份都不简单，原来这次的恐怖袭击是蓄谋已久的复仇，如今的受害者是当年的施暴者，而残酷战争的因果即将到来，维和警察能否带领大家安全逃生，完成这次的致命行动？Ed Helms饰演主角Nathan Rutherford，这个住在新英格兰小镇的主角不太能面对自己生活上的变化。　　殷志源在最近也表现出了相当的乒乓球实力。虽然曾经一度是体育最弱体，但在所属社内的乒乓球热潮掀起之后，他开始积极活跃，让人们的期待值越来越高。Logic UnitIf the number of network packets exceeds the upper limit, network congestion will occur. Slow response (consumption of network bandwidth resources)Household machine: