The decrease in the amount of dopamine can result in one or more general signs of Parkinson's disease.

VOA: special.2009.04.07

In particular, they increase the amount of norepinephrine, a neurotransmitter that's responsible for just general arousal.

具体来说,安非他命会引起,去甲肾上腺素释放量的增加,去甲肾上腺素,是种负责一般性唤醒的神经递质

耶鲁公开课 - 心理学导论课程节选

United Nations Secretary-General Ban Ki-moon said the amount of money was greater than expected.

VOA: special.2010.04.02