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美国最早发展起来,拥有的也最多,日本、西欧紧随其后,也在发展中国家推开。它推动了经济发展,被称为“未来战略产业的摇篮”——
The earliest developed United States has the largest share of Japan and West Europe followed by developing countries. It has promoted economic development, known as the “cradle of the future strategic industry” -