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Combination function is to encapsulate various algorithms into small functions one by one, for example, if level A is used, encapsulate a small function, if level B is used, encapsulate a small function, and so on; The following code:What is the event distribution mechanism?East Lake Park East Lake Park East Lake Park site is the ancient Quanzhou eight scenic "East Lake Lotus Fragrance" site. During the Tang Dynasty, the lake was more than 40 hectares, with East Lake Pavilion and Ergong Pavilion. Song YouBonn Pavilion; There are ancient pavilions in the Ming Dynasty. When lotus flowers are planted in full bloom, the fragrance of lotus flowers in Xinghu Lake wins. Tang Jiang Gongfu, Han Yu, Ouyang Zhan and others were famous for their activities. East Lake Park is characterized by Minnan architectural culture, with the central lake as the main body and cultural landscape arranged around the lake. Construction of Xinghu Lotus Fragrance, Qifeng Pavilion, Seven Stars Arch Moon, Ergong Pavilion, East Lake Pavilion, Bonn Pavilion, Rangu Pavilion and other quiet areas; Children's paradise, sunrise in Shuang Zhou and cruise ship dock are the moving areas. More than 20 plant rock landscapes, such as Erythrina Ruilin, etc., have been built in detail. Stone carvings and carvings highlight the stone culture in southern Fujian. It has both Quanzhou's historical and cultural connotation and the trendy flavor of the times, with unique style. He has won the provincial "Beautiful Environment Award" three times, and has also been named "Top Ten Buildings Loved by Citizens" and "Top Ten Night Scenes in Quanzhou". In 1998, it was selected into 100 famous Chinese gardens for its elegant, beautiful and exquisite garden style in the south of the Yangtze River.虞子期笑问道：霸王，有什么好消息？虞姬含羞地低下头去，项羽笑道：你呀……就快要当舅舅了。Threads a > A and B enter the first if judgment at the same time. B > A enters the synchronized block first, and since instance is null, it executes instance=new Singleton ();近未来的美国，全国失业率仅为1%，犯罪率则创下史上最低纪录，暴力几乎消失无踪。美利坚合众国仿佛进入宛如天堂的美好黄金时代，而促成这完美表象的则是前所未闻的大扫荡计划。国家为了有效释放公民心底的压抑和不满情绪，特别规定每年有一天的晚上7点之后举行长达十二小时的全国性大扫荡，届时人们将走上街头，展开完全不用承担法律责任的殴斗与杀戮。在这个畸形的时代，安保系统推销员詹姆斯·桑丁（伊桑·霍克配音）大发其财，与妻子儿女过着养尊处优的幸福生活。又是一年大扫荡之夜到来，桑丁一家端坐固若金汤的豪华府邸，在屏幕前观赏杀戮之夜的表演。谁知这一晚，詹姆斯的儿子查理出手拯救了一名被追杀的流浪汉，桑丁一家不可避免被卷入血腥的漩涡之中……