There are two classes, two broad classes of drug sort of type ligands that are defined, agonists and antagonists.

这样的配体药物有两类,目前已经明确的配体药物大体上分为两种,分别是激动剂和拮抗剂

耶鲁公开课 - 生物医学工程探索课程节选

This would an example of a substance that inhibits the action of a natural ligand and they can inhibit in a variety of ways.

这类物质能够以多种方式,抑制天然配体的作用

耶鲁公开课 - 生物医学工程探索课程节选