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我娘说，那些道理还是跟书本上差不多，不过是换个法子教。只是整日跟军汉们呆在一处，诸多不便，要想不为人察知，实在不是一件容易的事。External communication with a subsystem must be conducted through a unified facade object. The facade mode provides a high-level interface, making the subsystem easier to use. Each subsystem has only one facade class, and this facade class has only one instance, that is, it is a singleton pattern. But the whole system can have multiple facade classes.Pottan要去一个骑马营地，但最后到了一个回收中心，在那里她被一个奇怪的工作人员照顾。一天，Pottan发现工作人员正在制造一枚太空火箭。When listing solution options, I also hope you will pay attention to the most important point, that is, concreteness.Perhaps you have heard the DFU mode of iPhone. The full name of DFU is Development Firmware Upgrade, which actually means the forced upgrade and downgrade mode of iPhone firmware. For example, if there is an error (1) or error (6) when you downgrade the firmware of the iPhone, then when you restore or downgrade the firmware, you need to put your iPhone into DFU mode to completely downgrade.