Nearly 100 actors dressed as terracotta warriors perform during a campaign to promote tourism of Northwest China's Shaanxi province ahead of the World Expo in Shanghai, April 10, 2010. Shaanxi, well-known for the terra-cotta warriors of Qin Dynasty (221-206BC), sees the upcoming World Expo as a good opportunity to promote the local tourist resources to the world. [Photo/Xinhua]

Nearly 100 actors dressed as terracotta warriors perform during a campaign to promote tourism of Northwest China's Shaanxi province ahead of the World Expo in Shanghai, April 10, 2010. [Photo/Xinhua]