Drivers must be on the alert for traffic signals.
驾驶

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通过沿着神经元伸出的类似线状纤维(轴突)传递的电信号进行通信,并通过称为神经递质的化学信使在突触处将信号传送给邻近细胞。