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

咖啡因是一种刺激性药物，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.

所以咖啡作为兴剂的使用非常重要--它不只是早晨人们作为早餐要喝的东西。

We know how much these stimulants can cost us.

们明白俗世的刺激会让们付出惨痛代价。

But stimulants can play a positive role, too.

但兴剂也可以起到积极的作用。

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的知识，可以收看们制作的有关兴剂的节目。

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，它的许多药效，比如率加速，会导致身体对氧气的更大需求。

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

们对快乐的追求有许多不同的形式，比如性活动、娱乐刺激物和其他形式的娱乐。

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

啊，你是指咖啡因的神功效——咖啡因产生的效果，咖啡因是一种天然的兴剂，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的刺激作用。

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

据NPR新闻的山姆·桑德斯报道，其中一起事件牵涉德国运动员，该选手被查出使用刺激剂。

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

一些兴剂的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.

在大概十秒的范围内，血液携带一种叫做尼古丁的兴剂进入大脑，多巴胺和其他神经递质释放的触发，包括内啡肽，会通过制造愉快的感觉，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，烟草在此时发挥刺激物的作用会使率、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”上的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的物质。

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.

与咖啡极度相似的刺激物可以产生与真咖啡非常接近的认知和生反应，这表明长期饮用者对这些饮品的反应并不完全依赖于实际的化学刺激。

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的要求，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，但这不是她的错，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.

内向的人，经常与害羞的人混淆，往往对感官上的刺激更敏感，也因此倾向于较安静的场所、较少人的聚会、甚至较不辣的食物。