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1. State patterns define the relationship between state and behavior and encapsulate them in a class. By adding new state classes, it is easy to add new states and transitions徽州商人潘浩璋子承父业，背井离乡到扬州经商，重振丰泰商号的曲折故事和动人故事，反映了徽商的智慧与奋斗精神。Recovery mode is a boot system, which is used to perform certain operations that cannot run under normal boot state (such as installing a new ROM package, hard formatting the mobile phone, etc.). You can press and hold the power key and the volume reduction key to enter the Recovery mode at the same time when the mobile phone is turned off. After entering the Recovery mode, you can clean up the cache, clear the data and reinstall the system.Some plants are very picky when choosing pollinators. The flowers of European Trollius are like a real safe deposit box, and only six kinds of insects know the code to open the safe deposit box. These lucky people all come from the genus Brevicorn. Only they know how to get into the sepals of European Trollius and find the center of the flower. However, no matter how hard other insects try, they can only fail with disappointment. The short-horned flower fly, which has gone to great pains to pollinate European Trollius, will naturally receive considerable "remuneration". Female short-horned flower flies lay eggs on the carpels of flowers. When the larvae are hatched, they will eat the seeds of flowers and grow up. This symbiotic relationship also has certain risks for European Trollius. The more short-horned flower flies, the greater the chance of pollination, but at the same time, the more insects parasitic on flowers. The cooperative relationship between the two was formed millions of years ago and continues to this day. It is a model of relative balance and harmonious symbiosis in nature.周芷若让张无忌不要和赵敏成亲，张无忌竟然答应了。你还真是没眼光，挑了个狠的欺负，那不是自讨苦吃。•準則警察（玉置浩二）