pte听力考试让很多考生头疼，总是考不到理想的分数，那么pte听力需要具备哪些必备能力呢?今天给大家带来单词caffeine的用法。
caffeine
UK: ['kæfiːn]
US: ['kæ.fin]
n.
1.咖啡碱,咖啡因
2.咖啡硷
3.三甲黄嘌呤
1 . Theobromine, like caffeine, and also like the asthma drug theophylline, belong to the chemical group known as xanthine alkaloids.
可可碱与咖啡因、茶碱（哮喘药）一样，属于黄嘌呤生物碱家族。
2 . They're gonna charge me a few thou I don't have to tell me to rest a bit and not to drink alcohol or caffeine.
他们会收我几千块，不用说我也知道他们会告诉我休息休息，不要喝酒，不要摄入咖啡因。
3 . The key is to know how much of something we can have (especially if it's loaded with sugar or caffeine).
关键是要知道我们可以吃下多少那种东西（尤其是当里面充满了糖分或咖啡因时）。
4 . How you react to caffeine may be determined in part by how much caffeine you're used to drinking.
你对咖啡因的反应在一定程度上取决于你之前对咖啡因的摄入量。
5 . That's really the only reason I can think of as to why so many recent studies have come out on whether caffeine is "good" for you or not.
我能想到的是为什么最近出现很多对咖啡因是否对人有益的研究，只有这个原因。
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