突触连接神经细胞，其活动对于学习和记忆是很重要的，但它们也是，他说，大脑最脆弱的部分。
Synapses are the junctions between nerve cells, and their action is central to learning and memory. But they are also, he says, the most fragile parts of the brain.
鸣禽发声学习的控制系统主要由一条直接神经通路和一条辅助神经通路组成。
The song control system of songbird is mainly composed of direct pathway and acces - sory pathway.
神话认为，这是有史以来的第一本书，直接神源。
The myth suggests that this is the first book ever written, and of direct divine provenance.
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