caffeine
noun
ˈkæfiːn
noun
1
a
substance
in
tea,
coffee,
and
some
other
drinks
that
makes
you
feel
more
active
咖啡因，咖啡碱;
Avoid
caffeine
(=drinks
with
caffeine)
before
bedtime.
睡觉前不要喝含有咖啡因的饮料。
a
caffeine-free
cola
不含咖啡因的可乐