backup recovery system造句

例句与造句

1. For testing and training an emergency parachute backup recovery system was provided.
2. The clump weight below the bell, which served as a backup recovery system, was removed to enable the bell to be launched over the side of the " Wildrake " rather than through the ship's moon pool.
3. It's difficult to find backup recovery system in a sentence. 用backup recovery system造句挺难的