It is important that you do not expel the air or the barium. The air is used to expand the walls of the colon for a more detailed look at the lining of your colon. After the barium and air is in, the technologist will take a series of X-rays of your colon. You will be asked to hold your breath and remain still during the picture. An imaging physician will review the images to make sure that they are sufficient to make a diagnosis. If they are not, more pictures may be taken.
However, it is not known how the builders got the huge wooden support columns into position. Unlike western architecture, in ancient Chinese wooden architecture, the wall only defined an enclosure, and did not form a load-bearing element. Buildings in China have been supported by wooden frames for as long as seven millennia.
The Great Wall of China is one of the biggest structures ever made by humans. The ancient Chinese built the wall to protect against invading armies. Today it is a tourist attraction and a symbol of China. One of the largest engineering and building projects ever carried out is the Great Wall of China. Great Wall of China, Chinese (Pinyin) Wanli Changcheng or (Wade-Giles romanization) Wan-li Châang-châeng (â10,000-Li Long Wallâ), extensive bulwark erected in ancient China, one of the largest building-construction projects ever undertaken.