即使最轻微的风，也会让灰粒四溢，向由煤灰形成的沙尘暴一般遮盖天空。
With even the lightest wind, the tiny particles take flight, blotting out the sky like a thick sandstorm of ash.
一是地面上的沙尘物质。它是形成沙尘暴的物质基础。
One is the dust on the ground material. It is the material basis of form sandstorm.
大风日数和温度是沙尘暴形成的动力因子，植被覆盖度和降水是阻力因子。
Windy days and temperature are composed of the impetus factors of dust storm, and vegetation coverage and precipitation are the main resistance factors.
黄土形成时的沙尘暴活动比古土壤形成时要强的多。
Dust storms in Loess period were much stronger than in paleosol period.
沙尘暴主要从邻近的河北省形成，该地区15%的土地已经变成沙漠。
The sand originates largely from neighboring Hebei province where 15% of the land has turned into desert.
特殊地形、气候条件和富含沙尘源的下垫面是形成沙尘暴的物质基础；
The special topography, climate conditions and the underlying surface with the source of the abundant sand were the material base of forming sand and dust storm.
二是大风。这是沙尘暴形成的动力基础，也是沙尘暴能够长距离输送的动力保证。
2 it is winds. This is the power of the formation, is fundamental to the power of the sandstorm long-distance transport of guarantee.
所以说人类活动对沙尘暴的发生只起到一定作用，并不能说沙尘暴就是人为要素形成的。
So that human activities for the generation of dust storms only play a role, and can't say dust storms are caused by human factors.
自然灾祸，不时有肆无忌惮的人类砍伐森林，从而招致了自然的成绩，如水土流失，荒漠化，沙尘暴，形成少量毁坏。
Natural disasters, there have been unscrupulous human deforestation, which led to the natural problems, such as soil erosion, desertification, dust storms, causing extensive damage.
沙尘暴尘源物质的形成及分布是形成沙尘暴必不可少的物质条件。
The origin of the sand and dust in the sand-dust storm forms the indispensable material condition.
全球气候变化是北京沙尘暴出现的外部原因；人口压力过大，人地关系不协调则是北京沙尘暴形成的内部原因。
Outside cause of Beijing sandstorm is global climatic change, inner cause is overweight of population pressure and non-harmonious population-land relations.
全球气候变化是北京沙尘暴出现的外部原因；人口压力过大，人地关系不协调则是北京沙尘暴形成的内部原因。
Outside cause of Beijing sandstorm is global climatic change, inner cause is overweight of population pressure and non-harmonious population-land relations.
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