1. surgical interruption of a nerve pathway in the sympathetic nervous system. 
   阻断交感神经的手术。
2. A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at alpha receptors and that causes vasodilation and a decrease in blood pressure. 
   阿尔法神经阻断剂一种药物，可以抵制交感神经末梢在阿尔法受体释放出的正肾上腺素的兴奋性效果，并引起血管舒张和血压下降
3. A substance, C8H11NO3, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. 
   去甲肾上腺素一种物质，c8h11no3，是激素和交感神经冲动介导者，有强大的血管收缩作用和神经传导作用，会引起血压、心率和血糖含量的增高
4. not given sympathetic understanding. 
   没有表示同情的理解。
5. unobtrusively perceptive and sympathetic. 
   谨慎的、有理解力和同情心。

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