Great Wall of China
The Great Wall of China (, literally "ten thousand ''li'' long wall") is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe. Several walls were built from as early as the 7th century BC, with selective stretches later joined by Qin Shi Huang (220–206 BC), the first emperor of China. Little of the Qin wall remains. Later on, many successive dynasties built and maintained multiple stretches of border walls. The best-known sections of the wall were built by the Ming dynasty (1368–1644).Apart from defense, other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watchtowers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.
The frontier walls built by different dynasties have multiple courses. Collectively, they stretch from Liaodong in the east to Lop Lake in the west, from the present-day Sino - Russian border in the north to Tao River (Taohe) in the south; along an arc that roughly delineates the edge of the Mongolian steppe; spanning in total. Today, the defensive system of the Great Wall is generally recognized as one of the most impressive architectural feats in history. Provided by Wikipedia
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An Exceptional Portrait of Yang Zhu and Mozi by Yao-Cheng Chang
Published 2021-01-01
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The “Hand as Foot” teaching method in the aortic arch by Cheng Chang, Panpan Zhang
Published 2023-04-01
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Enhanced Thermoelectric Performance by Surface Engineering in SnTe-PbS Nanocomposites by Cheng Chang, Maria Ibáñez
Published 2021-09-01
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Exploring and exploiting cuticle biosynthesis for abiotic and biotic stress tolerance in wheat and barley by Xiaoyu Wang, Cheng Chang
Published 2022-11-01
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An Introduction of National Chengchi University Academic Hub by Chia-Cheng Chang, Zong-Lin You
Published 2019-12-01
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Research on Full Brake-By-Wire System and Clamping Force Estimation Strategy Based on Redundant Drive Motors by Liang Chu, Pengh Zhu, Cheng Chang
Published 2023-01-01
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Motor-Efficiency Estimation and Control of Multirotors Comprising a Cooperative Transportation System by Chia-Cheng Chang, Teng-Hu Cheng
Published 2023-01-01
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ZnO Nanorods as Antireflection Layers in Metal-Insulator-Semiconductor Solar Cells by Chung-Cheng Chang, Chia-Hong Huang
Published 2022-07-01
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Influence of Textile Structure on the Hygroscopic Behavior of Bamboo Textile-Reinforced Polymer by Chun-Wei Chang, Feng-Cheng Chang
Published 2022-11-01
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The Valuation of Contract Deposit and Purchase Price by Chien-Ming Huang, Ta-Cheng Chang
Published 2022-11-01
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