Introduced are the present situation and development of driverless metro technology in North America, Europe and Japan.
介绍了北美、欧洲和日本等国家无人驾驶地铁
现状及发展情况。
Introduced are the present situation and development of driverless metro technology in North America, Europe and Japan.
介绍了北美、欧洲和日本等国家无人驾驶地铁现状及发展情况。
明：以上例句、词性
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