Occasionally, they'll ask me to assay an unknown drugs substance.

有时，他们会让我化验某种不明药物。

youdao

It should then be possible to discover new uses for existing drugs as well as previously unknown mechanisms of action.

这将有助于发现已存在药物过去未知的机制及新用途。

youdao

Unlike scientists developing drugs, fear of the unknown has had no moderating influence on their activities.

不像科学家们开发药物，对未知的恐惧并未对央行活动产生抑制效果。

youdao

There are tens of thousands of Web sites that sell prescription drugs of unknown origin to Americans illegally.

FORBES: Bad Medicine

If drug developers could better target their inhibitors farther down the prostaglandin chain, they might produce powerful drugs that could fight pain and avoid unknown, possibly fatal, side effects.

FORBES: Magazine Article

Although Downey was far from unknown when he took the role, his past run-ins with drugs and jail made him an unlikely candidate for career revitalization.

FORBES: Box Office