Even innocuous substances can sometimes register a positive result in a drug test.
即使无害的物质在药物测试中有时也会呈阳性.
《简明英汉词典》
Scientists claim to have identified natural substances with cancer-combating properties.
科学家们声称已经发现自然界的某些物质具有抗癌特性。
《柯林斯高阶英汉双解学习词典》
These are substances which specifically latch onto the protein on the cell membrane.
这些物质专门依附在细胞膜的蛋白质之上。
《柯林斯高阶英汉双解学习词典》
Fire is a chemical action, or an action taking place between different chemical substances.
火是一种化学反应, 或者说,是发生在不同化学物质间的一种作用.
互联网摘选
It showed the mechanism of these antibacterial substances are bacterial action.
4对细菌的抑菌机理初步观察推断为抗菌物质为杀菌作用，而不是抑菌作用，其机理有待进一步研究证实。
互联网摘选
这样的绣线绝对消除了化学物质可能对人体带来的伤害.
互联网摘选
These substances caused the illness of those who breathed the polluted air.
这些物质便使吸入这种污染空气的人得病.
互联网摘选
