Travel Guide of Aba
The abacus, also called a counting frame, is a calculating tool that was in use in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the written Arabic numeral system. The exact origin of the abacus is still unknown.
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Jiuzhai Valley National Park
- Jiuzhaigou, or Jiuzhaigou Valley Scenic and Historic Interest Area, is a nature reserve and national park in northwestern Sichuan, China. Jiuzhaigou may also refer to: Jiuzhaigou County, containing the nature reserve Jiuzhaigou Town, former name of Zhangzha Town, a town in Jiuzhaigou County, Sichuan, China Jiuzhai Huanglong Airport, occasionally Jiuzhaigou [Huanglong] Airport