The oxygen react vigorously with the impurity in the iron.
氧气与铁中的杂质发生剧烈的化学反应。
The limestone absorb impurity from the ore and form a fluid slag which floats on the surface of the heavier molten iron.
石灰石吸咐了铁矿石中的杂质，形成浮在较重的铁水表面上的流动渣。
Workers are removing impurities from silver.
工人们正去除银中的杂质。
