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从明治初期开始,日本海军省就以水路部为中心全面系统地收集长江水文情报。数十年来,通过不断收集和翻译欧美编印的中国水路志、向长江派遣军舰和专业谍报人员实地测量调查、利用日籍航运公司和上海日本人引水协会收集情报,至20世纪二十年代末,日本海军已经详细掌握了长江及其支流的各种水文信息,为从长江入侵中国铺平了道路。
Since the early Meiji Period, the Japanese naval province has collected the Yangtze River hydrological information comprehensively and systematically focusing on the Ministry of Water Resources. For decades, by continuously collecting and translating the China Water Log compiled by Europe and the United States, it dispatched field surveys to warships and professional espionage officers in the Yangtze River and collected information by Japanese shipping companies and the Japanese Association of Japanese Water Diversions. By the end of the 1920s, , The Japanese navy has grasped various hydrological information of the Yangtze River and its tributaries in detail and paved the way for the invasion of China from the Yangtze River.