It's a stimulant drug, helping the brain get messages to the body quicker.

咖啡因是一种药物，帮助大脑更快地将信息传递给身体。

This information took the edge off Harry and Ron's desire for brain stimulants.

一听到这话，哈利和罗恩对醒脑剂就没那么感兴趣了。

So, the use of coffee as a stimulant became important -- it wasn't just a drink people drank in the morning, for breakfast.

所以咖啡作为兴剂使用非常重要--它不只是早晨人们作为早餐要喝东西。

We know how much these stimulants can cost us.

我们明白俗世会让我们付出惨痛代价。

But stimulants can play a positive role, too.

但兴剂也可以起到积极作用。

If you want to learn more about ADHD, you can watch our episode about stimulants.

如果你想了解更多关于注意力缺陷多动症知识，可以收看我们制作有关兴剂节目。

And nicotine is a stimulant, so avoid them too late in the day.

而且尼古丁是一种兴剂，所以不要深夜摄入。

Cocaine is a stimulant, and many of its effects, like increased heart rate, cause the body to need more oxygen.

可卡因是一种兴剂，它许多药效，比如心率加速，会导致身体对氧气更大需求。

Our pursuit of pleasure takes many different forms, such as sexual activities, recreational stimulants, and other forms of entertainment.

我们对快乐追求有许多不同形式，比如活动、娱乐物和其他形式娱乐。

Ah, you mean the caffeine hit – the effect of caffeine, which is a natural stimulant, on your brain making you feel more awake.

啊，你是指咖啡因提神功效——咖啡因产生效果，咖啡因是一种天然兴剂，作用于大脑，会让你感觉更清醒。

Tea, unlike coffee, contains L-theanine, a substance that eases the stimulant effects of caffeine.

茶不同于咖啡，茶含有茶氨酸，这种物质能缓解咖啡因作用。

NPR's Sam Sanders says one case involves a German athlete who tested positive for stimulant.

据NPR新闻·桑德斯报道，其中一起事件牵涉德国运动员，该选手被查出使用剂。

And some stimulants can function in the same way as antidepressants.

一些兴剂功能与抗抑郁药类似。

Within about 10 seconds, the bloodstream carries a stimulant called nicotine to the brain, triggering the release of dopamine and other neurotransmitters including endorphins that create the pleasurable sensations which make smoking highly addictive.

在大概十秒范围内，血液携带一种叫做尼古丁兴剂进入大脑，多巴胺和其他神经递质释放触发，包括内啡肽，会通过制造愉快感觉，使吸烟上瘾。

If you smoke at a specific time and setting, like on the porch at 6pm after dinner, and being a stimulant, it makes everything speed up, including heart rate, blood pressure, and wakefulness.

如果你经常定点定时吸烟，比如每晚饭后6点在走廊吸烟，烟草在此时发挥物作用会使心率、血压和觉醒度等集体窜升。

A study in the " Journal of Pediatrics" found their most common ingredients include caffeine, a stimulant, guarana, a stimulant, ginseng, a root that's believed to be stimulating, and lots of sugar.

一篇刊登在“儿科杂志”上研究发现这种饮料中通常会含有大量包括咖啡因、兴剂、瓜拉那、人参以及大量糖分在内物质。

Stimuli that closely mimic coffee can produce cognitive and physiological responses markedly similar to those of real coffee, indicating that regular consumers respond to these beverages independently of the actual chemical stimulant.

与咖啡极度相似物可以产生与真咖啡非常接近认知和生理反应，这表明长期饮用者对这些饮品反应并不完全依赖于实际化学。

To keep up with the demands of the Kaiser Keller club, George started taking prescription stimulants, which would cause him to froth at the mouth and to hallucinate.

为了满足凯撒凯勒俱乐部要求，乔治开始服用处方兴剂，这会导致他口吐泡沫并产生幻觉。

In January, a Russian disciplinary committee announced that while she had taken the banned stimulant trimetazidine, it wasn't her fault, but WADA, the global anti-doping authority decided to appeal.

今年1月，俄罗斯一个纪律委员会宣布，虽然她服用了违禁兴剂曲美他嗪，但这不是她错，但全球反兴剂机构世界反兴剂机构（WADA）决定上诉。

Introverts, often confused with shy people, tend to be more sensitive to sensory stimulants and prefer quieter surroundings, fewer people and even less spicy food.

内向人，经常与害羞人混淆，往往对感官上更敏感，也因此倾向于较安静场所、较少人聚会、甚至较不辣食物。