这些症状是一些具有释放神经递质多巴胺功能的神经细胞退化，多巴胺释放减少的结果。
These symptoms arise as the result of the degeneration of certain nerve cells which normally release the neural transmitter dopamine causing an insufficiency of dopamine.
帕金森氏症是由中脑中神经细胞的退化导致的疾病。这种机制导致了这些神经的缺失，然而现金大部分机制还不清楚。
Parkinson's disease is caused by the degeneration of neurons in the midbrain. The mechanisms leading to the loss of these neurons, however, are largely unknown.
波尔穆特说：“婴儿出生时就有一千亿个神经细胞，在他们的婴幼儿时期，这些细胞中的一部分会被利用，其它的就任其退化死亡，我们把这一过程叫做突触削减。”
"Babies are born with 100 billion neurons, " he says. "During the first years of life, some are salvaged and the others are left to wither. We call that synaptic pruning.
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