随着“神舟6号”的顺利升空，我国在航空航天技术上又向前迈进了一步。杨利伟、费俊龙、聂海胜都是我国优秀的宇航员，同时也是我们的民族英雄。想知道他们在宇宙飞船起飞前是如何刻苦训练的吗？想知道他们在飞船起飞后又要克服哪些困难吗？请看下文……
    If you were an astronaut up in space, you would find life very strange. You wouldn’t be able to walk, because in space you can’t keep your feet on the floor. You couldn’t drink, either, because drinks don’t pour in space. And you would have to sleep strapped(扎上安全带) in your bed to stop yourself from floating away.