名词
中文翻译：咖啡因
同义词：
['caffeine', 'caffeine substance', 'niacinamide例句：1. Coffee is a popular beverage in many countries.（咖啡是许多国家流行的饮料。）']
例句：
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1. Coffee is a popular beverage in many countries.
咖啡是许多国家流行的饮料。
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2.She added some cola to her drink.
她往她的饮料里加了点可乐。
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3.The caffeine in coffee can help you stay awake during the day.
咖啡中的咖啡因可以帮助你在白天保持清醒。