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. 当收缩过程继续进行下去，密度不断增大时，气尘云中心的尘埃就会变得极其浓密，因而能够吸收远红外辐射。
The explosion caused a huge black cloud of dust. 火山的爆发造成了一大片黑灰云。
