Volcanic ash, lapilli, block and bombs.
火山灰、火山砾、火山块和火山弹。
Test flights show no damage by volcanic ash.
试航显示火山灰不会影响飞机发动机工作。
There they cool and harden into volcanic ash.
然后在空中它们又冷却变成火山灰。
Study on volcanic ash reactivity of coal cinder at about
低温煤渣火山灰活性的机理研究
Volcanic ash silted up the Columbia River 35 miles away.
火山灰淤积在哥伦比亚河中长达35英里。
a siliceous volcanic ash used to produce hydraulic cement
用来生产硬水泥的含硅火山灰
A siliceous volcanic ash used to produce hydraulic cement.
火山灰水泥，火山石用来生产水硬水泥的含硅火山灰
Volcanic ash showered down on the town after the eruption.
火山喷发后, 小城落了一层火山灰。
Coal beds and volcanic ash falls are examples of marker beds.
煤层和火山灰堆是典型的标志层。
They ignored the erosion of the mountain by the volcanic ash!
他们忽视了山体被火山灰腐蚀的迹象！
Darkcolored ash and tiny volcanic rocks carpet the crater floor.
火山口坑底是灰色得火山灰和较小得火山岩。
Dense clouds of ash were generated during the volcanic eruption.
火山爆发时, 产生了浓密得火山灰云。
volcanic ash and lava build the mountains that we call volcanoes.
火山灰和火山岩在喷射口堆积构成了火山。
Mount Unzen has been spewing out volcanic ash, gas, and rock today.
云仙山今天一直在向外喷涌火山灰，气体和火山岩。
The ancient Romans discovered that volcanic ash made better cement.
古罗马人就发现火山灰使水泥更加坚固。
the opening at the top of a volcano from which forth spews volcanic ash
火山的顶部开口，从哪里喷出火山灰。
Weather satellites have observed a ring of volcanic ash girdling the earth.
气象卫星观测到一个环绕地球的火山灰带。
Study on the Structure of Artificial Silica Fume and Activity of Volcanic Ash
人造硅灰结构及火山灰活牲研究
Mounds of pumice and volcanic ash mark its center, where the volcano remains.
浮石和火山灰得土墩标志着它得中心，是火山得遗迹。
Natural zeolites form where volcanic ash layers react with alkaline groundwater.
天然沸石形成于与碱性地下水起化学反应的火山灰层之中。
These things on the earth are actually all volcanic ash from volcanic eruptions.
地上的这些物质其实全部都是火山爆发时喷出的火山灰。
Volcanic ash filled the sky, blotted out the sun, and triggered hail and lightning.
天空充满了火山灰，遮盖了太阳，触发了冰雹和闪电。
The spider was encased in volcanic ash at the bottom of what would have been a lake.
这只蜘蛛被包埋在一个曾经的湖底的火山灰中。
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。
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