Level 5 · word 7,550 of 20,000
caffeine
/kæˈfiːn/
American
- n. 咖啡因, 咖啡碱
- Definition
- n. a chemical in coffee and tea that makes you feel more awake
- Example
- Too much caffeine in the evening can keep you awake at night.
- 晚上摄入太多咖啡因会让你夜里睡不着。