Caffeine

['kæfiːn] or ['kæfin]

解释:

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

邦妮整理--From WordNet

解释:

(n.) A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.

整理:玛丽斯

解释:

n. the alkaloid or active principle of coffee and tea.

校对:尼古拉斯