The analysis indicates that the transporting force of sand-storm activity and matter in sand dust source area are the decisive factors of sand storm activity.
分析表明，沙尘暴活动的搬运动力和沙尘来源区物质所处状态是沙尘暴活动与否的决定因素。
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。
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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