Sulphides; polysulphides, whether or not chemically defined.

硫化物；多硫化物，不论是否已有化学定义。

As it happens, seafloor massive sulphides are also huge-at least they were until recently.

碰巧的是，至少目前海底块状硫化物也是巨大的。

The gold minerals have close relation with sulphides, which is favourable to the gold recovery.

金矿物与硫化物关系密切，有利于金的回收。

In this paper some newer methods for the synthesis of saturated cyclic sulphides were presented briefly.

本文简要介绍近年来各类饱和环硫醚的合成方法。

The results show that they comprise mainly RE_2O_2S in addition to a few sulphides and oxides of rare earth.

结果表明，它们主要由RE_2O_2S组成，还含有少量稀土硫化物和稀土氧化物。