Volcanic ash showered down on the town after the eruption.

火山喷发后，小城落了一层火山灰。

A cloud of volcanic ash is spreading across wide areas of the Philippines.

一大片火山灰正在向菲律宾的大块区域扩散。

The culprit was volcanic ash from Mount Pelée in Martinique.

罪魁祸首是马提尼克岛培雷火山释放的火山灰。

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！

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

这两个激光雷达均非出自火山灰监测的需要。