火山灰的沉积物覆盖了整个小镇。

The deposition of volcanic ash covered the town in a thick layer.

空中密布着火山灰。

The skies were clogged with volcanic ash.

罪魁祸首是马提尼克岛培雷火山释放的火山灰。

The culprit was volcanic ash from Mount Pelée in Martinique.

火山的顶部开口，从哪里喷出火山灰。

The opening at the top of a volcano from which forth spews volcanic ash

火山灰淤积在哥伦比亚河中长达35英里.

Volcanic ash silted up the Columbia River 35 miles away.

这只蜘蛛被包埋在一个曾经的湖底的火山灰中。 大概是在一次火山喷发中，火山灰把它从网上打落下来，并使其窒息。

The spider was encased in volcanic ash at the bottom of what would have been a lake.

现在的南达科塔，当时被火山灰覆盖着大地。

Where South Dakota is today, volcanic ash carpeted the terrain.

这两个激光雷达均非出自火山灰监测的需要。

Neither has been driven by the needs of volcanic ash monitoring.

这里的土壤来源于火山灰和砂质壤土。

The soils are derived from volcanic ash and consist of sandy to sandy-loam earth.

但火山灰对喷气引擎的大部分影响仍有待研究.

But much about the impact of volcanic ash on jet engines remains unstudied.