free-fall acceleration

例句：

1. 1. In the free-fall of space, time slows down.
   在太空的自由落体中，时间变慢了。
2. 2. The free-falling object was caught by a net.
   自由下落的物体被网子接住了。
3. 3.The astronauts experienced the free-fall acceleration during their descent.
   宇航员们在下降过程中体验了自由落体加速度。