In the 1990s, when the campaign for iodization began, the world's greatest concentration of iodine-deficient countries was in the landlocked former Soviet republics of Central Asia.
二十世纪90年代，当碘化运动开始时，全球碘缺乏国家最集中的区域是中亚内陆的前苏联加盟共和国。
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Ventilation in the public places should be strengthened not only in the environment of central air condition but also in the normal air condition, and monitored the concentration of HCHO continuously.