求翻译：单向传布 神经冲动在中枢部分传布时，只能由传入神经元向传出神经元的方向进行，不能逆传。这种单向传布的特征由中枢内突触传递的特性决定。因此，在反射弧中兴奋只能从脊髓背根传入，由腹根传出，而不能相反，即背根是感觉性的，腹根是运动性的，这个规律叫做贝尔-马让迪定律。是什么意思？

Unidirectional spread of nerve impulses in the central part of the spread only by afferent neurons to the direction of the efferent neurons can not retrograde. This one-way spread characteristics determined by the characteristics of synaptic transmission in the central. Therefore, excited only in th

One-way carrying nerve impulses in the central part, can only be transmitted by incoming neurons to the neurons in the opposite direction, not the reverse. This one-way spread by the characteristics of the central characteristics of the pass. Therefore, the excitement can only be reflected in an arc

Disseminates the nerve impulse unidirectionally disseminates when the main center part, only can by spread to the neuron to spread the neuron the direction to carry on, cannot the sequence of development of symptoms.This kind disseminates unidirectionally characteristic characteristic decision which

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