stimulant [ˈstɪmjələnt]

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n.刺激物，兴奋剂

something which makes or causes something else to grow or develop

It is used in medicine for its stimulant quality. 由于它有兴奋剂的特性而被应用于医学。
Musk is used for perfume and stimulant. 麝香可以用作香料和兴奋剂。