1. A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse. 
   神经传送体通过神经键传递神经脉冲的化学物质，如碱性有机化合物或多巴胺
2. An amino acid, C9H11NO4, formed in the liver from tyrosine and converted to dopamine in the brain. 
   多巴一种胺基酸，c9h11no4，由酪胺酸在肝脏中生成并在大脑中变为多巴胺
3. [29] This coincides with an increase in dopamine, known for years to be the brain chemical responsible for part of nicotine's pleasure. 
   [29]这正好和多巴胺的增加发生了巧合，多年来，多巴胺被认为是使人感受到尼古丁所带来的部分快感的大脑化学物质。
4. Any of a group of amines derived from catechol that have important physiological effects as neurotransmitters and hormones and include epinephrine, norepinephrine, and dopamine. 
   儿茶酚胺一种从苯磷二酚中获得的胺，具有神经传感和荷尔蒙的重要生理功能，包括肾上腺、去甲肾上腺素和多巴胺
5. [30] Smokers, say the researchers, may have a lower risk of Parkinson's disease, because the nerve disease is aggravated by shortages of dopamine. 
   [30]研究人员说，也许烟民患帕金森病的危险性较小，因为这种神经系统的疾病就是因为缺乏多巴胺而加重的。

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