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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:至于和谈，夫人说的是，两国一直这样的打下去也不是个办法，寡人可以给汉国一丝机会。2. How to realize the publish-subscribe mode?尤其是到了现在，任何事情都需要谨慎小心，贸然行事可能会出现前功尽弃，最怕的就是被对方寻找机会，大好局面毁于一旦，甚至危急到自己本身的既得利益和生死存亡。Step 3: Do not put on the startup key/power key, and press the HOME key for another 10 seconds. This step is to turn off the phone and the screen is black.Create multiple product objects in multiple product families. Q: How? A: Each specific factory creates multiple product objects in a product family, and multiple specific factories can create multiple objects in multiple product families."White balance, simply speaking, is white balance. For example, if there is a yellow lamp in the room, then a piece of white paper will be photographed into yellow paper. The color of the brilliance reflected by the object depends on the color of the light source. The reason why human eyes regard some objects as white is that the human brain can detect and correct color changes like this. Therefore, no matter in sunlight, cloudy weather, indoors or fluorescence, the color of the white objects people see is still the same. The human eye can debug itself, but mobile phones are not so intelligent. At this time, the automatic white balance of the camera, AWB, is required. Photographing in AWB mode can restore the real color. "