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一英国海军调查船《挑战者》号于1872—1876年调查中曾深入南海,这是国外在南海的最早的调查。1873年,日本开始在南海调查。在英、日调查船进入南海五十多年之后,1929年丹麦的《达纳》号和荷兰的《斯内利尼斯》号调查船才先后进入南海调查。日本进入南海调查虽早,但大规模调查开始于三十年代。当时,日本为了准备和发动侵略战争,于1936—
A British naval survey ship Challenger went deep into the South China Sea during the 1872-1876 survey, which was the earliest foreign survey in the South China Sea. In 1873, Japan began to investigate in the South China Sea. Fifty years after the British and Japanese research ships entered the South China Sea, the Danish “Dana” and the Dutch “Snell Nice” survey vessels entered the South China Sea in 1929. Japan entered the South China Sea survey early, but the large-scale survey began in the thirties. At that time, Japan in preparation for and launch a war of aggression, in 1936-