caffeine

'kæfi:n

Collins 1

n. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

n. 咖啡因, 咖啡碱
[化] 咖啡因; 咖啡碱

Collins 星级

22,623

BNC 频率

9,489

使用频率

caffeine 由词根 caff（与咖啡相关）和后缀 -ine（常用于化学物质）组成。可以联想为“咖啡因”是咖啡中一种化学物质。

例句

1. I like to drink coffee in the morning because it helps me wake up with the caffeine.

我喜欢早上喝咖啡，因为咖啡因可以帮助我清醒。

2. Too much caffeine can make you feel anxious and jittery.

过多的咖啡因会让你感到焦虑和不安。

3. Many people rely on caffeine to stay alert during long work hours.

很多人依赖咖啡因在长时间的工作中保持清醒。