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It seems harmless to say that someone is very forgetful; however, for a nation, forgetfulness may eventually lead to new disasters! Therefore, I always think that it is necessary and beneficial to be willing to think deeply about the past seriously, whether it is tragic or comic. Now, it may take some effort to find this place on the map. If you get a bird's eye view from an airplane, it will be easier to see it clearly. This is: in the southwest of Shandong - from the south of Jining to the north of Xuzhou, Jiangsu, there are Dushan Lake, Nanyang Lake, Weishan Lake and Zhaoyang Lake, connected from north to south, and are called the Nansi Lakes. This area spanning the junction of Jiangsu, Shandong, Henan and Anhui provinces on both sides of Longhai Road was called the Four Lakes Border Area during the Anti-Japanese War.