夹杂着的灰层显示死亡是定期发生的。
The interspersing layers of ash show they were a regular occurrence.
浓厚的火山灰层大量降下到爱琴海，遮盖了岛屿和农作物。
A heavy layer of volcanic ash rained down over the Aegean, covering islands and crops.
试验结果表明，纯氧化物的氯化过程受化学反应控制，钛铁矿氯化受灰层扩散控制。
It was resulted that the chlorination process of simple oxide is under chemical reaction control, while that of ilmenite is dependent on the ash layer diffusion.
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