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211. X.X.17在小静的帮助下逃过难关的圭一也是一个不善于察言观色的男人。This idea is exactly the same as what we often use. MyCollection defines some operations of the collection, MyIterator defines a series of iterative operations, and holds Collection instances. Let's look at the implementation code:When the process is reasonable, When contingency plans are adequate, It is time to show the real strength. Look at the recovery situation after the emergency. The main reference is that the business interruption time is generally less than 10min-15min, which depends on the importance of the business and cannot be determined in a word. Then there is the business recovery time. The shorter the recovery time, the simpler and more efficient the plan. Finally, there is the business recovery situation, and the corresponding business tests are directly carried out.元帅善于军事谋划，使得敌国的军民都胆寒畏惧，这些都是元帅的长处。Finally, a Light.prototype.setState method is provided, through which the state object can switch the state of the light object. The switching rules of states are well defined in each state class in advance. No more conditional branch statements related to state switching can be found in Context: