Because the removal of phosphorus and sulfur require special condition that can be met only by the basic process.
因为除去钢中的磷和硫需要一些特殊的条件, 这些条件只有碱性法才能满足。
A sulfide compound containing at least two sulfur atoms per molecule.
多硫化物每个分子中至少含有两个硫原子的一种硫化物
sulfur can be used to make gunpowder.
硫磺可以用来制造火药。