该地区开始成功地用奎宁作为预防剂。

The region began to use quinine successfully as a prophylactic.

《柯林斯英汉双解大词典》

他们把鸦片作为镇静剂，而不是作为麻醉剂。

They use opium as a sedative, rather than as a narcotic.

《柯林斯英汉双解大词典》

在西非，人们长期以来都咀嚼可乐果作为兴奋剂，因为它们含有在茶、咖啡和巧克力中天然存在的咖啡因。

In West Africa, people have long chewed kola nuts as stimulants, because they contain caffeine that also occurs naturally in tea, coffee, and chocolate.

youdao

An agonist is a substance that mimics the action of a natural ligand, and I show you a couple of examples of agonists here.

激动剂是能够模拟天然配体分子的物质,在这里我给出了一些激动剂作为例子

耶鲁公开课 - 生物医学工程探索课程节选

Now, sometimes the agonist is the natural ligand itself and that's - an example of that is when you use insulin as a drug.

有时激动剂药物就是天然配体分子,例如将胰岛素作为药物使用

耶鲁公开课 - 生物医学工程探索课程节选