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Sales staff at a shopping center in Beijing do radio in this file photo taken in 1971. [Xinhua]
Physical education teachers learn a set of radio gymnastic exercises in Beijing in this file photo taken on Sept 1, 1981. [Xinhua]
![Sales staff at a shopping center in Beijing do radio in this file photo taken in 1971. [Xinhua]](http://images.chinagate.cn/attachement/jpg/site1021/20100810/001aa0b6194e0dcaf4a618.jpg "Sales staff at a shopping center in Beijing do radio in this file photo taken in 1971. [Xinhua]")
![Physical education teachers learn a set of radio gymnastic exercises in Beijing in this file photo taken on Sept 1, 1981. [Xinhua]](http://images.chinagate.cn/attachement/jpg/site1021/20100810/001aa0b6194e0dcaf4ad19.jpg "Physical education teachers learn a set of radio gymnastic exercises in Beijing in this file photo taken on Sept 1, 1981. [Xinhua]")