ash cloud的用法和樣例：
例句
- As contraction continues and the density increases, the dust becomes so thick at the center of the cloud that it absorbs the far-infrared radiation.
當收縮過(guò)程繼續進(jìn)行下去，密度不斷增大時(shí)，氣塵云中心的塵埃就會(huì )變得極其濃密，因而能夠吸收遠紅外輻射。 - The explosion caused a huge black cloud of dust.
火山的爆發(fā)造成了一大片黑灰云。
