n.

1. 刺激；刺激品；興奮劑[C][（+to）]
   Under the stimulus of this inspiring motive, she bustled about with new energy.

   在這個令人振奮的動機刺激下，她精力充沛地忙碌著。

   Praise is a stimulus for better work.

   讚揚激勵人更努力地工作。

n.

1. a thing that evokes a specific functional reaction in an organ or tissue.
2. something that promotes activity, interest, or enthusiasm.