A tour guide shows how ancient people warmed themselves with charcoal fires during the winter. [Photo: CRIENGLISH.com]
(CRI July 30, 2009)
![A tour guide shows how ancient people warmed themselves with charcoal fires during the winter. [Photo: CRIENGLISH.com]](http://images.china.cn/attachement/jpg/site1007/20090730/000d87ad3cdd0bdb8cb202.jpg "A tour guide shows how ancient people warmed themselves with charcoal fires during the winter. [Photo: CRIENGLISH.com]")
