Cold air sweeps parts of China on Winter Solstice(1/3)

A man, wrapped himself tightly, rides a bicycle in the street of Nanjing, capital of east China's Jiangsu Province, December 22, 2011, as the temperature plunges. The arrival of Winter Solstice is also the beginning of "count nine" (数九) , which Chinese people believed as the coldest period in winter days. [CFP Photo]