gravitation energy

例句：

1. 1. Thespacecraft's propulsion system uses gravitational energy to accelerate the spacecraft.
   航天器的推进系统利用引力能量来加速航天器。
2. 2.The gravitational force between two objects is a fundamental concept in physics.
   两个物体之间的引力是物理学中的一个基本概念。
3. 3.Gravitational waves are ripples in the fabric of space-time caused by the acceleration of massive objects.
   引力波是由大质量物体加速引起的空间时间结构上的波动。