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1·Caffeine can cause palpitations and headaches.

咖啡因能引起心悸和头痛。《柯林斯英汉双解大词典》

2·Tea contains caffeine. It's bad for your health.

茶含有咖啡因，对你的健康不利。《柯林斯英汉双解大词典》

3·It is a well-known fact that caffeine is a stimulant.

咖啡因是兴奋剂，这是人所共知的事实。《牛津词典》

4·As little as 50 mg of caffeine can produce pharmacological effects.

仅仅50毫克的咖啡因就能产生药理效果。《柯林斯英汉双解大词典》

5·Caffeine is the active constituent of drinks such as tea and coffee.

咖啡因是茶和咖啡这类饮品的活性成分。《柯林斯英汉双解大词典》

6·Caffeine, a substance found in coffee and some soft drinks, is also a drug.

咖啡因，咖啡和一些不含酒精的饮料中的一种物质，也是一种毒品。

7·There could be less protein, more sugar and some additives you wouldn't expect, such as caffeine.

可能会有更少的蛋白质，更多的糖和一些你意想不到的添加剂，比如咖啡因。

8·Caffeine, the stimulant in coffee, has been called the most widely used psychoactive substance on Earth.

咖啡中的咖啡因因被称为“地球上使用最广泛的精神活性物质”。

9·Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards.

茶碱是咖啡因的近亲，也是茶中的主要兴奋剂，它在这两方面都是最有效的化合物之一。

10·In West Africa, people have long chewed kola nuts as stimulants, because they contain caffeine that also occurs naturally in tea, coffee, and chocolate.

在西非，人们长期以来都咀嚼可乐果作为兴奋剂，因为它们含有在茶、咖啡和巧克力中天然存在的咖啡因。

咖啡因

1·Tea contains caffeine. It's bad for your health.

茶含有咖啡因，对你的健康不利。《柯林斯英汉双解大词典》

2·It is a well-known fact that caffeine is a stimulant.

咖啡因是兴奋剂，这是人所共知的事实。《牛津词典》

3·There could be less protein, more sugar and some additives you wouldn't expect, such as caffeine.

可能会有更少的蛋白质，更多的糖和一些你意想不到的添加剂，比如咖啡因。

4·Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards.

茶碱是咖啡因的近亲，也是茶中的主要兴奋剂，它在这两方面都是最有效的化合物之一。

5·Even caffeine, which is generally known only for its stimulatory effects, displays this property, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.

就连人们通常觉得有刺激作用的咖啡因，也表现出了这种特性，它在浓度极低的情况下会抑制老鼠的运动，而在浓度较高的情况下则会刺激老鼠。

咖啡碱

1·The results showed that much of caffeine in green tea could be removed using supercritical CO2 and better moisture content of green tea for extraction is 40%.

试验结果表明，超临界CO2萃取技术可以有效地脱除绿茶中大部分的咖啡碱； 较佳的茶叶含水量为40%左右；

2·The results showed that contents of polyphenols, catechins, caffeine and amino acids decreased, off_flavor aroma got weak and tea cream decreased with the drop of raw material grade.

结果表明，随原料级别的降低，所制罐装绿茶水中多酚类、儿茶素、咖啡碱、氨基酸的含量下降；

3·White tea, as one of six tea, retains a large quantity of polyphenols, theanine, caffeine and other nutrients compared to other teas because of its unique procedures.

白茶作为中国六大茶类之一，由于其特殊的加工工序，相较于其他茶类，保留了大量的茶多酚、茶氨酸、咖啡碱等营养成分。

4·The results showed that the content of anthoxanthin, Zn, caffeine and anthocyanin in the special purple tea was higher than that in Yunkang 10, while that of theanine and catechin is lower.

结果表明，特种紫茶在黄酮类、咖啡碱、锌和花青素含量上较对照要高，而茶氨酸和儿茶素总量则较对照低；