天空由于充满柴油机的浓烟和煤灰而如此黑，我几乎看不见。
The air is so black with diesel fumes and coal dust, I can barely see.
测定了煤灰的松装密度和煤灰中铀浸出率。
The apparent densities and uranium extractions of ash products are determined.
这次撞击使地球大气层充满烟尘和煤灰，连太阳都被遮住了。
The impacts would have filled the atmosphere with smoke and soot and blotting out the Sun.
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