Northwest China's Ningxia Hui Autonomous Region has adopted digital technology (preserve) ancient cliff (悬崖) carvings and paintings before their disappearance.
Workers have copied more than 2, 000 immovable rock carvings and paintings at Helan Mountain to digitalize the overall views as well as (they) accurate locations. The digital information will be sorted and workers will conduct a disease analysis.
Rock carvings (appear) before writing systems were invented. Now, more than 20, 000 cliff paintings and carvings were created by the ancestors have been discovered at Helan Mountain. The works record the lives of the people who lived 3, 000 to 10, 000 years ago. In general, (image) of animals dominate (占主要地位), followed humans, vehicles, plants, planets, fingerprints and abstract signs. The surfaces were (main) carved with stone or metal in the open air, (expose) to weather beaten.
The protection of rock paintings and carvings is a worldwide issue. At present, there is no (effect), naturally scientific and technological means to prevent their disappearance. Some experts have predicted that by the end of this century, quarter of the world's rock paintings will disappear completely.
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