caffeine

简明释义

英[ˈkæfiːn]美[kæˈfiːn]

n. [有化][药] 咖啡因；茶精（兴奋剂）

英英释义

单词用法

同义词

反义词

例句

1.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”。

2.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。

3.Cut back on caffeine and alcohol.

减少咖啡和酒精的摄入。

4.If you feel tired from drinking less caffeine, take a short nap.

咖啡喝少了疲倦的话，就小睡一会儿。

5.Plus, if you're going the caffeine route, morning is the best time for it.

另外，如果你有喝咖啡的习惯的话，早上是最好的时间。

6.First, I must disclose that I'm biased. I love my caffeine.

首先，我必须说明，我是有倾向性的，我喜欢咖啡。

7.If you're addicted to caffeine, then break the addiction first.

如果你很依赖咖啡因类饮料的话，你要先改掉这个习惯。

8.Too much caffeine 咖啡因 can lead to insomnia.

过多的咖啡因可能会导致失眠。

9.Energy drinks often contain high levels of caffeine 咖啡因.

能量饮料通常含有高水平的咖啡因。

10.Some people are sensitive to caffeine 咖啡因 and feel jittery after a cup of coffee.

有些人对咖啡因很敏感，喝完一杯咖啡后会感到紧张不安。

11.I try to limit my caffeine 咖啡因 intake in the afternoon.

我尽量在下午限制我的咖啡因摄入。

12.I need a cup of coffee to get my caffeine 咖啡因 fix in the morning.

我早上需要一杯咖啡来补充我的咖啡因。

作文

Caffeine is a natural stimulant that is most commonly found in coffee, tea, and various energy drinks. It is known for its ability to increase alertness and reduce fatigue, making it a popular choice among students and professionals alike. When consumed, caffeine acts on the central nervous system, blocking the effects of adenosine, a neurotransmitter that promotes sleep. This results in increased levels of other neurotransmitters, such as dopamine and norepinephrine, which can enhance mood and cognitive function.Many people rely on caffeine to help them wake up in the morning or to stay focused during long hours of work or study. A typical cup of coffee contains about 95 milligrams of caffeine, while a cup of black tea has around 47 milligrams. Energy drinks can contain even higher amounts, sometimes exceeding 200 milligrams per serving. However, moderation is key, as excessive intake of caffeine can lead to negative side effects such as anxiety, insomnia, and increased heart rate.The effects of caffeine can vary from person to person, depending on factors such as individual tolerance and genetic predisposition. Some people can consume large amounts of caffeine without experiencing any adverse effects, while others may feel jittery or anxious after just a small amount. This variability makes it important for individuals to be mindful of their own reactions to caffeine and adjust their intake accordingly.In addition to its stimulating effects, caffeine has been studied for its potential health benefits. Research suggests that moderate consumption of caffeine may be associated with a reduced risk of certain diseases, including Parkinson's disease, Alzheimer's disease, and some types of cancer. Furthermore, caffeine has been shown to enhance physical performance by increasing adrenaline levels, which can improve endurance during exercise.However, it is essential to approach caffeine consumption with caution. Pregnant women, individuals with certain medical conditions, and those who are sensitive to caffeine should consult with healthcare professionals regarding their intake. Additionally, it is important to consider the source of caffeine; while coffee and tea can offer health benefits, many energy drinks and sodas are high in sugar and other additives that can negate the positive effects of caffeine.In conclusion, caffeine is a widely consumed stimulant that can enhance alertness and improve cognitive function. While it can offer several benefits, it is crucial to consume it mindfully and be aware of individual tolerance levels. As with many substances, balance is essential, and understanding how caffeine affects your body can lead to a healthier relationship with this popular compound.

咖啡因是一种天然兴奋剂，主要存在于咖啡、茶和各种能量饮料中。它以增加警觉性和减少疲劳而闻名，因此在学生和专业人士中非常受欢迎。消费后，咖啡因 对中枢神经系统产生作用，阻断促进睡眠的神经递质腺苷的效果。这导致多巴胺和去甲肾上腺素等其他神经递质的水平增加，从而可以增强情绪和认知功能。许多人依赖 咖啡因 来帮助他们早晨醒来或在长时间工作或学习期间保持专注。一杯普通咖啡大约含有95毫克的 咖啡因，而一杯黑茶大约含有47毫克。能量饮料的含量可能更高，有时每份超过200毫克。然而，适度是关键，因为过量摄入 咖啡因 可能导致焦虑、失眠和心率加快等负面影响。咖啡因 的效果因人而异，这取决于个体耐受性和遗传倾向等因素。有些人可以在没有任何不良影响的情况下摄入大量 咖啡因，而其他人可能在仅摄入少量后就感到紧张或焦虑。这种变异性使得个人需要留意自己对 咖啡因 的反应，并相应地调整摄入量。除了刺激效果外，咖啡因 还因其潜在的健康益处而受到研究。研究表明，适度摄入 咖啡因 可能与某些疾病的风险降低相关，包括帕金森病、阿尔茨海默病和某些类型的癌症。此外，咖啡因 已被证明可以通过提高肾上腺素水平来增强身体表现，从而改善运动耐力。然而，谨慎对待 咖啡因 的消费至关重要。孕妇、某些疾病患者以及对 咖啡因 敏感的人应咨询医疗专业人士以了解他们的摄入量。此外，考虑 咖啡因 的来源也很重要；虽然咖啡和茶可以提供健康益处，但许多能量饮料和苏打水含有高糖和其他添加剂，这可能会抵消 咖啡因 的积极效果。总之，咖啡因 是一种广泛消费的兴奋剂，可以增强警觉性并改善认知功能。虽然它可以提供多种益处，但关键是要谨慎消费，并意识到个体的耐受水平。与许多物质一样，平衡至关重要，了解 咖啡因 如何影响你的身体可以促成与这种流行化合物的更健康关系。