Instead, up to 30% of its weight could be slag—the toxic gunk left over when steel is made.

反而，高达30%的重量可以是矿渣，这是一种在制钢过程中产生的有毒废料。

A dam broke on Friday causing mud and mining debris to flood into the city and in other parts of the region.

上周五，一决堤，导致泥浆和矿渣涌入城市和区的其他方。

The workers wore sleazy working clothes to carry slag and slate.

工人们穿着的工作服工找矿渣和板岩。

The results: concrete slugs made with ingredients like fly ash and slag held up remarkably well after more than a month.

成分为粉煤灰和矿渣的混凝土塞在一个多月以后依旧保持完好。

Now, the part of ejected scoriae and ashes seemed to my mind a very rough one to act.

现在，喷射出的矿渣和灰烬的部分在我看来是一个非常粗糙的表演。

The solution? Novel blends of concrete that use cheap leftover materials from the coal and steel industries: fly ash, silica fume and slag.

有解决方法吗？使用粉煤灰、硅粉和矿渣等来自钢铁工业的廉价剩余材料制造新的混凝土。