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.

无论在中央空调环境下还是在普通空调环境下的公共场所，均要加强通风换气，并应加强对室内甲醛浓度的连续性地追踪监测。

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It also offered that the concentration of population from natural villages to central villages should be regarded as one of the urbanization forms.

这种人口由自然村向中心村镇的集中也应看作是城市化的一种形式。

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They were then sent to an internment camp in central France before being shipped east to Nazi concentration camps.

VOA: standard.2010.04.10

The team has now used these data to compile the largest catalogue of the central concentration of stars in the Milky Way ever created.

ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are

In the same way that mass production moved the locus of industry from small shops to huge factories, today's mutations have the potential to shift us away from business models based on economies of scale, asset intensification, concentration and central control.

FORBES: McKinsey Quarterly

Diabaly's mayor told the BBC that Malian and French forces had been patrolling the outskirts of the town, which is believed to be the base for the largest concentration of Islamists in central Mali.

BBC: Mali conflict: France aiming for 'total reconquest'