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Observer mode: pay attention to encapsulating object notification, support the change of communication object, realize the change of object state, notify and update the objects that depend on it.Magic Attack +5 (Online +9)Through participating in the competition of the first season of "Charming China City", many unknown cities have entered the public's view and the city's economy has increased significantly. Yan'an received 50.59 million tourists in 2017, up 25.68% year-on-year. The city's comprehensive tourism income totaled 29.87 billion yuan, up 31% year-on-year. Lu'an received 45.0186 million domestic and foreign tourists in 2017, with a total tourism revenue of 35.027 billion yuan, up 25.36% and 37.12% respectively. Liangshan Prefecture received 44.192 million tourists in 2017, with tourism revenue reaching 36.108 billion yuan, up 8.28% and 19.71% respectively. During the Spring Festival Golden Week this year, 5.128 million tourists visited Liangshan, up 47% year on year. Shiyan City has embarked on a new way of poverty alleviation through tourism, which is "poverty alleviation drives rural tourism, and rural tourism promotes poverty alleviation". Up to now, the city has invested 780 million yuan in special poverty alleviation funds, 2.6 billion yuan in social funds, 1.1 billion yuan in agricultural-related funds, 56 demonstration villages for rural tourism, and more than 50,000 poor people have been lifted out of poverty and become rich under the drive of rural tourism industry.唯一解决的办法。电视剧《LUCA》是以未知的世界“遗传学”为题材，讲述了某个被世界遗弃的人激烈的追踪记。该剧以达尔文的《物种起源》为基础，用大胆的素材开启了前所未有的玄幻剧篇章。System.out.println ("user1 exe! ");