retractable launching device

例句：

1. 1. The spacecraft uses a retractable launching device to launch its payload into space.
   该航天器使用一种可缩回的发射装置将有效载荷送入太空。
2. 2. The new missile system employs a retractable launching device that can be easily deployed and disassembled.
   新型导弹系统采用了一种易于部署和拆解的可缩回发射装置。
3. 3.The military has been testing a retractable launching device for several years, hoping to improve the accuracy of their missiles.
   军方已经测试了这种可缩回发射装置几年，希望提高他们的导弹精度。