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In Europe the Restriction of Hazardous Substances (RoHS) directive limits the use of many toxic materials in new electronic products sold in the European Union.
欧洲的有害物质限制(RoHS)指令限定了在欧盟国家出售的新的电子产品中使用许多有毒原料。
By defining temperature and time limits under which these reactions have to be carried out the formation of potentially hazardous substances is minimised.
反应香料在反应过程当中，通过对温度和时间的控制和限定，将所可能产生的有害物质的数量降低到最低的程度。
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