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中、日、韩三国同属于世界上的胃癌高发国家。中、韩的发病率2002~2008年没有明显变化。日本的发病率下降了大约30%。您想知道这究竟是为什么吗?
China, Japan and South Korea belong to the high-incidence countries in the world. The incidence of China and South Korea did not change significantly from 2002 to 2008. The incidence in Japan has dropped by about 30%. Do you want to know why this is the case?