...总悬浮颗粒物中,粒径大于10μm的粒子由于体积和质量大,在重力作用 下能很快降落到地球表面,这部分颗粒物称为降尘(drop dust),也叫落尘,单 位面积的降尘量是评价大气污染程度的指标之一。但也有学者指出,降尘为空气 动力学直径大于30μm的粒子。
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The contents of heavy metal in drop dust do not vary significantly with increasing altitude.
降尘中重金属元素含量随高度没有显著变化规律。
参考来源 - 开封市近地层大气颗粒物垂直分布特征研究·2,447,543篇论文数据,部分数据来源于NoteExpress
Mr Dombey's cup of satisfaction was so full at this moment, however, that he felt he could afford a drop or two of its contents, even to sprinkle on the dust in the by path of his little daughter.
然而,董贝先生这时杯子里却装满了称心满意的酒,装得很满很满,因此他甚至可以把其中的一两滴洒到他的小女儿的小径中的尘土上。
Armor C12 convertible notebook has a die-cast magnesium alloy case, and has been tested for drop-shock, moisture, temperature extremes, and resistance to dust and vibration.
ArmorC12 convertible笔记本电脑具有印模压铸的镁合金外壳,已经通过了跌落冲击、潮湿、极端温度与防尘和抗振动测试。
Fresh from his honeymoon, Hazem Gamal heard his wedding ring drop as he fled into a toll booth by the Brooklyn Battery Tunnel to escape the dust cloud from the crumbling south tower.
Hazem Gamal刚度完蜜月,还处在新婚的甜蜜中。当时,世贸大厦南楼逐渐坍塌,在周围形成了如乌云般的尘土,为了逃避,他躲进了布鲁克林隧道的街边收费亭,这时他听到了婚戒掉落的声响。
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