A worker helps a blind woman to walk across the street by using a crutch at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker introduces to the blind people the way of using a crutch by voice at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker helps a blind man to walk by using a crutch at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker helps a blind man to walk across the street by using a crutch at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker helps a blind woman to walk across the street with a crutch at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker helps the blind people to walk with a crutch by giving out whistle signals at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)

A worker distributes crutches to blind people at the Yuhuangge Square in Yinchuan City, capital of Northwest China's Ningxia Hui Autonomous Region, May 14, 2013. An activity aimed at helping the blind to walk was held here on Tuesday, in which more than 100 blind people were provided with crutches as they were helped to walk with them ahead of the 23rd national day for helping the disabled on May 19. (Xinhua/Peng Zhaozhi)