北京航天城
北京航天城-
北京航天城污水处理厂CASS法工艺调试及运行
CASS Wastewater Treatment Process for Beijing Space Flight Center
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杨利伟在北京航天城的一次新闻访问中详解了中国载人航天工程的下一步。北京航天城是个研究和训练中心，正常不对公众开放。
Yang Liwei detailed the next stages of China 's human spaceflight programme during a press visit to Space City in Beijing , a research and training centre normally closed to the public .