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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。《牛津词典》

2·Musk is used for perfumes and stimulant.

麝香被用作香料和兴奋剂。《新英汉大辞典》

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。《新英汉大辞典》

6·Phendimetrazine Tartrate is a stimulant synthesized for use as an anorexiant.

酒石酸苯二甲酯是一种合成的用于厌食症的刺激剂。

7·Wait. Nicotine is a STIMULANT.

等一下，尼古丁是一种兴奋剂。

8·It is well known that caffeine is a stimulant.

众所周知，咖啡是一种兴奋剂。

9·It is psychoactive, a stimulant and addictive.

它作用于人的神经系统，是一种兴奋剂，让人上瘾。

10·Coffee is a stimulant. Alcohol is a depressant.

咖啡是种兴奋剂，而酒精是种抑制剂。