政府的公告作为进一步研究的刺激因素。

The government's announcement served as a ___stimulus for further research.

积极的反馈可以是提高表现的巨大动力。

Positive feedback can be a great ___stimulus for improving performance.

石油的发现为该地区的发展提供了必要的刺激。

The discovery of oil provided the necessary ___stimulus for the region's development.