source of dust

During dust storm, the contributions of the non-local sources at Beijing were as high as 97%, and it is the dominant source of atmospheric particles in Beijing.

沙尘暴期间外来源贡献最高达97%，成为北京犬气颗粒物的主要来源。

Different threshold friction velocities and occurrence frequencies of strong wind account for the different dust emission capabilities for source areas.

不同的起沙阈值条件和风速频率分布与沙尘释放能力的不同相对应。

Test of Dust Size-grading in Combustion Source

燃烧源排尘粒度分级的测试

It showed that the most important source of tea lead pollution were vehicle tail gas and coal-fired emissions. The pollution way of tea was atmospheric dust not soil.

说明西湖龙井茶叶铅来源于汽车尾气和燃煤排放，主要污染途径为大气降尘，而不是土壤。

Total Amount Controlling of Carbon Dust and Management of Key Pollutant Discharging Source in the Production of Carbon

炭素生产中的炭尘排放总量控制与重点点源管理

Its rocks are the source of sapphires, And its dust contains gold.

伯28:6地中的石头有蓝宝石 、 有金沙.