The current stratovolcano-a cone-shaped volcano built from successive layers of thick lava flows and eruption products like ash and rock fragments-is built on top of an older stratovolcano.

这个层状火山是由稠密的熔岩流以及火山灰和岩石碎片等喷发物所形成的连续层堆积而成的锥形火山，它位于一个更老的层状火山之上。

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The current stratovolcano — a cone-shaped volcano built from successive layers of thick lava flows and eruption products like ash and rock fragments — is built on top of an older stratovolcano.

如今层状的尤耶亚科火山(由一层一层的火上熔岩和火山喷发产生的灰尘和碎石形成的火山锥)是在一座更加古老的层状火山上形成的。

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Ash clouds like this are impressive to see, and they can have a dramatic influence on air quality and vegetation, including crops.

类似这样的火山灰云触目惊心，其对空气质量以及包括农作物的植被具有剧烈的影响。

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There was a profusion of exceptions, including religious holidays like Ash Wednesday and the Solemnity of the Ascension, but nobody, including ticket agents, seemed to know them all.

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The operator should use an independent risk evaluator for weather and other environmental conditions like volcanic ash or even heavy pollutants which can effect helicopter operation and pilot visibility.

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