They say passengers who sit for hours need to drink plenty of water not liquids that contain alcohol or caffeine.

VOA: special.2009.07.14

They're more likely to think oh, caffeine, yeah.

他们更可能思考，或许真是咖啡因的作用。

耶鲁公开课 - 心理学导论课程节选

And everyone at the office would get really tired because they don't have their caffeine.

没补充咖啡因，在办公室的每个人都会感到疲惫。

Let's 实战 - SpeakingMax英语口语达人

They suggested better labeling with the amount of caffeine and other ingredients clearly listed on the drink.

VOA: special.2009.07.22

Philosophers and psychologists knew for a long time that getting smacked in the head could change your mental faculties; that diseases like syphilis could make you deranged; that chemicals like caffeine and alcohol can affect how you think.

哲学家和心理学家在很久以前便知道,头部受到重创,会改变你的心理官能,像梅毒这样的疾病可以让你精神错乱,像咖啡因和酒精这样的化学药品,可以影响到你的思维

耶鲁公开课 - 心理学导论课程节选

The directions also advise people to limit caffeine products and to drink only half the bottle if they want a moderate amount of energy.

VOA: special.2009.07.22

People who have many drinks with caffeine,like coffee, experience more stress and produce more stress hormones.

VOA: special.2009.03.24

Doctors say people should limit the amounts of alcohol and caffeine in their diets.

VOA: special.2009.03.24

They appeal mainly to young people and are fueled mainly by caffeine.

VOA: special.2009.07.22

Nineteenth-century cyclists and others used alcohol,caffeine,cocaine -- even strychnine,a strong poison.

VOA: special.2011.04.12

And three: the amount of caffeine varies greatly.

VOA: special.2009.07.22

Doctors sometimes use caffeine to treat migraine headaches.

VOA: special.2010.03.30

Interestingly, caffeine also can cause some migraines.

VOA: special.2010.03.30