self-propelled robot craft是什么意思

用法例句

Remote control target ship is an indispensable training equipment during the peaceful times, which provides real training conditions for the Navy and enhances the combat level.

遥控靶船是和平年代不可缺少的训练用设备，它可以为海军打靶训练提供更加真实的环境，进一步提高海军的实战水平。