stimulant

a. 兴奋性的,激励的,鼓舞的
n. 兴奋剂,酒精性饮料

It is hoped that the tax cuts will act as a stimulant to further economic growth.

希望降低税率这一措施能刺激经济进一步增长。

Coffee and tea are mild stimulants.

咖啡和茶都是温和的兴奋剂。