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。

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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。

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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。

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Mangroves are the most readily available source of firewood for fires to boil seawater and what is called "salt dust" scraped from the soil.

VOA: standard.2010.03.29

These are a key source of toxic PBDEs in household dust.

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Sweet Spot Petra has gobbled up market share in Southeast Asia, leaving its European and U.S. competitors in a cloud of cocoa dust. 2005 market share (dollar value) Source: Euromonitor International.

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