initial planet造句

例句与造句

1. In a three-body or larger system, a gravity assist trajectory might be available such that a carefully aimed escape velocity projectile would have its trajectory modified by the gravitational fields of other bodies in the system such that the projectile would eventually return to orbit the initial planet using only the launch delta-v.
2. It's difficult to find initial planet in a sentence. 用initial planet造句挺难的