1. It is a well-known fact that caffeine is a stimulant. 咖啡因是兴奋剂,这是人所共知的事实。
2. Musk is used for perfumes and stimulant. 麝香被用作香料和兴奋剂。
3. Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards. 茶碱是咖啡因的近亲,也是茶中的主要兴奋剂,它在这两方面都是最有效的化合物之一。
4. Caffeine, the stimulant in coffee, has been called "the most widely used psychoactive substance on Earth". 咖啡中的咖啡因因被称为“地球上使用最广泛的精神活性物质”。
5. 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。