caffein是什么意思？

caffein

英['kæfi:n] 美['kæfin]

• n. 咖啡因，茶精（一种兴奋剂）；

例句

• They appear appeal mainly to young people and are fueled mainly by caffein caffeine. 他们主要受到年轻人的喜爱,而且原料主要是咖啡因.

英英词典释义

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