求翻译：当细胞一端的细胞膜受到刺激（阈刺激），其通透性发生改变，使细胞内外正负离子的分布发生逆转，受刺激部位的细胞膜出现除极化，使该处细胞膜外正电荷消失而其前面尚未除极的细胞膜外仍带正电荷，从而形成一对点偶（dipole）。是什么意思？

Positive charge when the cell end of the cell membrane by the stimulation (threshold stimulation), the permeability change, so that the cells inside and outside the distribution of positive and negative reversal in stimulated parts of the cell membrane depolarization, so that the premises outside th

When one side of the cell membrane by stimulating ( 20 20) to stimulate its passage changed, both within and outside the cells are negative ions distribution of reversal occurs membrane, the stimulation of the body, polarization in addition to the positive charge outside cell membranes disappear in

When a cell end cell membrane receives the stimulation (threshold stimulation), its permeability has the change, causes inside and outside the cell the positive and negative ion distribution to have the reversal, is stimulated the spot the cell membrane to appear except the polarization this place,

When one end of the cell membrane is stimulated (threshold stimulus), its permeability changes inside and outside the cell distribution of positive and negative ions reversed, stimulate the parts of the cell membrane depolarization occurs, so that positive charge outside the cell membrane disappear