An enormous umbrella-shaped cloud of ash shot out of the volcano and then fell over the mountain and the surrounding vil一朵灰烬形成的巨大伞状云从火山喷出，笼盖了整座山与邻近村落。
By the addition of an umbrella-shaped baffle above the feed sprayer in the column, the liquid entrainment from the colum在精馏塔进料喷头上方增设伞形档板，可以减少精馏塔带液量。