"This place was hell," says Tom Levy cheerfully as he stands over an open pit filled with ancient coal-blackslag.
“这个地方以前几乎是个地狱，”托马斯·莱维风趣的说到，他站在一处被古老的墨黑炉渣填满的露天矿坑中。
2
It is actually black in color and the package says; contains slag and coal.
“它实际上是黑颜色的包说，”包含炉渣和煤。
3
In the third part, the preparation of flocculant from slag and pyrite cinder and its application in the treatment of cotton pulping black liquor were studied.