http://en.wikipedia.org/wiki/Pacific_War In September 1940, Japan decided to cut China's only land line to the outside world by seizing Indochina, which was controlled at the time by Vichy France. Japanese forces broke their agreement with the Vichy administration and fighting broke out, ending in a Japanese victory. On 27 September Japan signed a military alliance with Germany and Italy, becoming one of the three Axis Powers. In practice, there was little coordination between Japan and Germany until 1944, by which time the U.S. was deciphering their secret diplomatic correspondence. =>为了切断中国的对外联系而进攻法属印度支那 http://en.wikipedia.org/wiki/Japanese_invasion_of_French_Indochina In early 1940, troops of the Imperial Japanese Army (IJA) moved to seize Longzhou in south Guangxi, where the eastern branch of the railroad from Hanoi reaches the border, and also tried to move west to cut the rail line to Kunming. Chinese resistance, supplied from Indochina, was tough. Then on 22 June 1940, France signed an armistice with Germany, Japan's Axis ally. This established the neutral but under Axis influence Vichy France government in the unoccupied part of France. Vichy France also controlled at that time most French overseas possessions, including Indochina. The IJA captured Longzhou, closing one route, but the rail line to Yunnan was still open. Japanese aerial bombing did not close it. Japan pressured the Vichy government to close the railway, but the French did not agree. =>因为未能迅速切断交通线，所以选择向维琪政府施压 http://en.wikipedia.org/wiki/French_Indochina_in_World_War_II Catroux, who had first asked for British support, had no source of military assistance from outside France, stopped the trade to China to avoid further provoking the Japanese. A Japanese verification group, headed by Issaku Nishimura entered Indochina on June 25. =>维琪法国受到日本施压要终止与中国的交通线 http://ww2history.com/experts/Akira_Iriye/Japanese_invasion_of_Indochina So what the Japanese do is, in order to win this victory in China, they want to cut off the shipment of arms from the West, from the United States and also via the Northern Vietnamese route or the Northern Burmese route. So Japan puts pressure on Great Britain to close the so-called Burma Road, also puts pressure on the French authorities in Vietnam to let the Japanese stay there, basically, essentially, occupying Northern Indochina, and making sure that no shipment went from Indochina into China. =>为了打败中国，日本希望阻断位於中南半岛的通道 http://www.desertwar.net/japanese-invasion-of-french-indochina.html In 1940, Japan had complete control of China’s coastal ports and cut off supplies by sea transport of the Chinese government. To further cut China’s arms supply lines and forced the Chinese out of the war, Japan invaded French Indochina in order to cut off supply routes from there to China. =>为了彻底切断中国的对外联系，日本入侵法属印度支那 所以说，日军占领法属印度支那真的和在中国的泥淖战况毫无关系吗? -- The nation which forgets its defenders will be itself forgotten. ～John Calvin Coolidge, Jr. --

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