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After releasing all the keys, the screen is completely black and enters DFU mode. At this time, opening itunes will prompt you to restore your mobile phone. If the time is not well controlled, it is recommended that the novice use the Red Snow tool to enter DFU mode, and can operate according to the prompts. Click Download Red Snow to open the Red Snow tool and select "Other". As shown in the figure, the iPhone screen will display the code to walk patiently and wait for the progress bar to finish during the operation according to the Chinese prompt. When the prompt is completed, the DFU mode has been successfully entered. As shown in the figure. Second, enter the detailed steps of recovery mode. (screen display icon)　　绫罗记This is like subscribing to the "China Youth" newspaper in the post office for one year. If the post office has a new "China Youth" newspaper, it will deliver a new "China Youth" newspaper to your mailbox. If you don't subscribe to it in one year, then the post office won't send you newspapers.　　然而，一切并非如此简单，死亡与阴谋的狂潮随即袭来。在这场丧失人性的角力战中，注定没有胜利者……他看看围在身边的四个儿子和重臣，再透过他们身隙看向空荡荡的大殿——刚才还站满文武百官，现在都散了，这让他有一种日暮西山、末日来临的感觉。Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example: