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拉萨市地处雅鲁藏布江支流拉萨河中下游北岸，是西藏自治区首府，是西藏政治、经济、文化的中心，全市七县一区，总面积近3万平方公里，总人口37．3万人，属半农半牧区，平均海拔3700米的河谷冲积平原，是西藏碘缺乏病的严重病区之一。三四7年对该市所辖4县进行病情监测，结果?
Lhasa is located in the middle and lower reaches of the Lhasa River, a tributary of the Brahmaputra. It is the capital of the Tibet Autonomous Region and the center of Tibet’s politics, economy and culture. It has a total area of nearly 30,000 square kilometers and a total population of 373,000, The agricultural and semi-pastoral areas, with an average altitude of 3,700 meters above sea level, are one of the serious ward areas for iodine deficiency disorders in Tibet. Three or four years of the city under the jurisdiction of 4 counties monitoring the results?