名词
中文翻译：咖啡因
同义词：
['caffeine', 'caffeine']
例句：
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1.Caffeine is a stimulant that can be found in coffee and tea.
咖啡因是一种存在于咖啡和茶中的兴奋剂。
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2.The study found that caffeine consumption was linked to increased productivity.
研究发现，咖啡因的摄入与提高工作效率有关。
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3. Many people use caffeine as a way to stay awake during long flights.
许多人使用咖啡因作为长时间飞行保持清醒的方法。