空间科学家们预言,到八十年代末,将会有好几十人在外层空间长期生活和工作,时间长达几个月,甚至几年之久。随着空间工业化时代的到来,将来还要向空间移民,甚至建设空间城市等。但是在实现这一步之前,还有许多问题要解决。且不说其他的技术难题,光是如何在空间处理宇航员排出的粪便和日常生活中的垃圾,以及为宇航员补充新鲜食物、空气和水等,就是一个很令人头痛的难题。 Space scientists predict that by the end of the 1980s dozens of people will live and work in outer space for a long period of time, months or even years. With the advent of the era of industrialized space, immigrants will even have to go to space in the future and even build space cities. But there are still many problems to solve before this step can be taken. Not to mention other technical problems, how to deal with astronauts excretion in the space and everyday rubbish, as well as supplementing astronauts with fresh food, air and water, is a very troubling problem.