Most economists, including Tara Sinclair of The George Washington University, say these initiatives show that the U.S.central bank is taking aggressive action.

VOA: standard.2009.03.18

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 is the season for action. Now is when we must bring the best ideas of both parties together and show the American people that we can still do what we were sent here to do.

VOA: standard.2009.09.10