Drivers must be on the alert for traffic signals.
驾

须密切注意交通信号。
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He explained how a neuron communicates via electric signals which pass along thread-like fibres, axons, protruding from the neuron, and are transmitted to neighbouring cells by chemical messengers called neurotransmitters across a synapse.
他解释了神经元如何
过沿着神经元伸出
类似线状纤维(轴突)传递
电信号进行
信,并
过称为神经递质
化学信
在突触处将信号传送给邻近细胞。