When he flapped his wings, a cloud of grey ash filled the air.
当他扑打双翼时, 一团灰烬弥漫在空气里。
An ash cloud from a volcano is causing problems for airplanes.
一座火山喷发出的火山灰层导致航空出现问题。
The cloud is a mixture of ash, acids, aerosols and other particles.
这块云是灰尘, 酸, 悬浮微粒以及其他物质的混合物
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