无人驾驶的

Scientists say these unmanned flights can make important and exciting discoveries.

科学家们说这次无驾驶的太能够获得令兴奋的重大发现。

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驾驶地铁技术的现状及发展情况。