基于各种努力，与2000年相比，北京市空气中的硫化物含量减少了近一半，工业烟尘排放量则减少了三份之二。
Because of that and other changes, Beijing’s sulfur emissions have been cut almost in half compared with 2000, and industrial dust has decreased by two-thirds.
重质燃料油中通常含有一定量的硫及硫化物，燃烧过程中绝大部分形成二氧化硫，二氧化硫在一定条件下与氧化合形成三氧化硫。
The most of sulfur and sulfide that exist in the heavy fuel oils can be transformed into SO2, and SO2 can be oxidized to form SO3 during combustion of heavy fuel oil at certain condition.
韭菜的香气成分全部集中于所含精油中，确定其主要成分为二硫和三硫化合物等20种物质。
The essential oil contains all kinds of the aromatic substances in Allium tuberosum Rottl. ex Spr. Determined by GC-MS-DS, 20 compounds in essential oil are mainly disulfides and trisulfides.
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