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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:More than a decade ago, the U.S. Cyber Command began to develop a digital weapon: a malicious computer worm called Stuxnet. This may be the world's first digital weapon. As reported by the New York Times, it was originally used against the Iranian government to obstruct Iran's nuclear program. In covert operations and military secrets, the U.S. Government has never publicly admitted the super factory virus, nor has the Israeli government publicly admitted to cooperating with the U.S. Government in developing the virus.Understanding of virtual agent merging http requests:自离婚之后，福斯特医生和儿子汤姆一度过着平静又有些沉闷的生活，—直至前夫西蒙的请柬飘然而至，他和女友凯特已经结婚，并准备重新搬回嘉玛所住的街区，福斯特医生和儿子已经平静安稳的生活再次掀起波澜。-R.! I2 c; [5 i $w + e; } 9 G　　除了简单的说明，整部影片不再有言语。本片的主角是憨态可掬，形态各异的鸟。他们带我们飞过大海，飞过雪原，飞过高山；他们用振动的羽翼向我们诠释飞翔，诠释执着，诠释温情，诠释生命。