having or relating to two poles or extremities 有两极的,双极的 a sharply bipolar division of affluent and underclass. 富裕阶层和下层社会的明显两极分化。 ■(of psychiatric illness) characterized by both manic and depressive episodes, or manic ones only (精神病)具躁狂和抑郁交替发生特征的,躁郁的,双极性的 ■(of a plant or animal species) of or occurring in both polar regions 两极地区的;出现在两极地区的 ■(of a nerve cell) having two axons, one either side of the cell body (神经细胞)两极的,双极的 ■(Electronics)(of a transistor or other device) using both positive and negative charge carriers (电子)(晶体管等)双极的