n.[药]咖啡因,咖啡碱,茶精(兴奋剂)
Caffeine can cause palpitations and headaches.
咖啡因会引起心悸和头痛。
As little as 50mg of caffeine can produce pharmacological effects.
仅仅50毫克的咖啡因就能产生药理效果。
The caffeine in coffee can jangle the nerves.
咖啡中的咖啡因会使神经紧张。