| 单词 | active substance |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔active〕The liver contains many biochemically active substances.肝脏含有很多生化活性物质。外研社新世纪〔bioflavonoid〕Any of a group of biologically active substances found in plants and functioning in the maintenance of the walls of small blood vessels in mammals.生物类黄酮：发现于植物中的一组生物活性物质，对哺乳动物的小血管壁有维护作用美国传统〔international unit〕A unit of potency for similarly active substances, based on this quantity and accepted as an international standard.国际单位：一个相似活性物质的效能单位，以此量为基础并被作为国际标准单位美国传统〔international unit〕The quantity of a biologically active substance, such as a hormone or vitamin, required to produce a specific response.生物国际单位：生物学活性物质，例如激素或维生素，产生某种特殊效应所需的量美国传统〔racemization〕Conversion of an optically active substance to a racemic form.外消旋转化：将光学活性物质转化为外消旋形式美国传统 |
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