A layer of ash的意思|示意

Around the same time, a massive volcanic eruption in the Wrangell Mountains in Alaska occurred, blanketing the area in a layer of ash, up to a foot deep, called the White River tephra.

大致在同一时期，阿拉斯加州的弗兰格尔山脉出现了大规模的火山爆发，这个地区遂被深达一英尺的怀特河火山灰所覆盖。

A heavy layer of volcanic ash rained down over the Aegean, covering islands and crops.

浓厚的火山灰层大量降下到爱琴海，遮盖了岛屿和农作物。

At a specific layer of a jig bed, its parameters as bulk density, true density, ash content, and density fractions bear a certain relationship.

跳汰机床层某一位置的散密度、真密度、灰分、各密度级含量等床层参数之间存在着一定的相互关系。

The results of the study have shown that a rationally structured layer can lead to a significant reduction of fly ash quantity and carbon content.

结果表明：采用结构合理的阻挡燃烬层，可使飞灰份额和飞灰含碳量明显降低。

Then, a heat percolation model was developed by the analogy of heat conduction in the ash layer to random resistor network.

在自行设计的实验台上研究了积灰有效导热系数随分形维数以及温度的变化规律，发现实验结果与模型预测结果一致。