Caption: Mali, 2001. A tree weathers a sandstorm. The Sahara desert is a key source of dust storms, particularly in the area covering Mauritania, Mali, and Algeria.
描述：2001年，马里，一棵挨过了一场沙尘暴的树。撒哈拉沙漠，特别是毛里塔尼亚、马里以及阿尔及利亚地区，是沙尘暴的主要来源。
Aim to determine the main source of dust pollution in the air in Shang Lan Area, to tackle the problem directly.
目的确定上兰地区空气中尘污染的主要来源，便于针对性治理。
The purpose of researches on urban dust is focused on the source of dust material, composition of dust, distribution, migration and evolution, pollution effects and prevention and cure.
研究城市灰尘的目的是研究其物质来源、物质成分、分布规律、迁移演化、污染效应、防治治理等。
Source of dust removal equipment Botou pay warmly welcome all to visit, study, business negotiations.
泊头市薪源除尘设备有限公司热诚欢迎各界前来参观、考察、洽谈业务。
Source of dust removal equipment Botou paid to the abundant strength, reasonable prices, excellent service and a number of enterprises established long-term cooperative relationship.
泊头市薪源除尘设备有限公司以雄厚的实力、合理的价格、优良的服务与多家企业建立了长期的合作关系。
Source of dust removal equipment Botou paid to the abundant strength, reasonable prices, excellent service and a number of enterprises established long-term cooperative relationship.
泊头市薪源除尘设备有限公司以雄厚的实力、合理的价格、优良的服务与多家企业建立了长期的合作关系。
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