《731》上映首日票房超3亿元，上海是贡献最多票房的城市

Group 1 - The film "731" broke multiple records on its opening day, becoming the highest single-day screening champion in Chinese film history with over 270,000 showings [1] - As of September 18, the film's box office exceeded 300 million yuan, with over 7.71 million viewers [3] - The film is set against the backdrop of the end of World War II in 1945, revealing the atrocities committed by the Japanese Unit 731 in Harbin under the guise of "water supply and epidemic prevention" [3] Group 2 - Guangdong province contributed the most to the film's box office, accounting for 11.01%, followed by Jiangsu at 9.52%, with Zhejiang and Sichuan ranking third and fourth respectively [3] - Shanghai led the cities in box office contribution with 3.67%, while Beijing and Chengdu ranked second and third [3] - The production company issued a statement demanding the cessation of unauthorized distribution and streaming of the film's content, citing copyright infringement [3]