数值模式是研究酸性污染及其长距离输送特性的一种重要方法。
Numerical simulation is one of the important methods to study air pollution and long range transport of acid species.
春季多数清洁站点PM_（10）浓度偏高与长距离输送有关；
Elevated PM10 concentrations in spring are closely related to long-range transport.
此次沙尘暴长距离输送过程中，主要有两个高浓度中心向东传输。
In the process of the long distance of this dust storm event, there are two high concentration centers transporting eastward.
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