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1. Thischemical is used to remove rust from metalsurfaces.
这种化学物质用于从金属表面去除锈迹。
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2. The process involves dissolving thesulphur in water and then addingit to the solution.
这个过程涉及将硫溶解在水中,然后将其添加到溶液中。
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3.Sulfuric acid is a powerfuloxidizing agent that can beused to clean and disinfect surfaces.
硫酸是一种强氧化剂,可以用来清洁和消毒表面。