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。
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