1. The astronauts are conducting a series of experiments to learn more about how the body adapts to weightlessness. 那些宇航员正在进行一系列实验，以便更多地了解人体如何适应失重状态。
2. Uniformly, these people experienced weightlessness and the sensation that their bodies were being stretched lengthwise. 无一例外地，这些人都体验到了失重和身体被纵向拉伸的感觉。
3. More importantly, scientists are already queuing for seats on these low-gravity space-flight services so they can collect data during a few minutes of weightlessness. 更重要的是，科学家们已经在排队争取这些低重力太空飞行服务的座位了，这样他们就可以在几分钟的失重状态下收集数据。
4. Astronauts in flight must adjust to weightlessness. 飞行中的宇航员必须适应失重状态。
5. Astronauts are accustomed to the state of weightlessness. 宇航员们习惯于失重状态。
