冬春之交,是西北地区沙尘暴频繁侵袭的季节。刚才还是红日当头的睛朗天气,突然间,狂飚骤起,大风怒吼,扬起枯叶,卷起沙尘,不一会黄雾黑云遮日蔽空,一时间白天像夜晚一样昏暗。 这样的狂风,不知从何处刮来?有人说,阿拉善山口是沙尘暴的重要源头,还有人说,安西风库在推波助澜。根本原因还是由于西北这一片土地,树木 The turn of winter is the season of frequent sandstorms in the northwest. Suddenly, when the crazy Biao rises suddenly, the wind roars, lifts dead leaves and winds up the dust. Within a short while, . Some people say that the Alashan Pass is an important source of sandstorms. Some people say that the Anxi Wind Store is fueling the storm. The fundamental reason is due to the northwest this piece of land, trees