unmanned

an unmanned spaceflight

无人驾驶宇宙飞行

an unmanned spacecraft.

无人驾驶宇宙飞船

an unmanned level crossing.

无人管理道口。

the need for unmanned and expendable launch vehicles.

对不回收无人驾驶载火箭需要。

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

科学家们说这次无人驾驶太飞行能够获得令人兴奋重大发现。

A Royal Marine poses for photographers with the Unmanned Vehicle Robot, Testudo, at the launch of the Defence Technology Plan in London February 26, 2009.

皇家海军陆战队构成摄影师与无人机机器人，陆，在推出国防科技计划在伦敦2009年2月26日。