polarity
/pəʊˈlærətɪ/noun
(pl. -ies)［mass noun］
1- the property of having poles or being polar极性：
it exhibits polarity when presented to a magnetic needle.
在磁针面前, 它会表现出极性。
1.1
- the relative orientation of poles; the direction of a magnetic or electric field相对极向; 磁场方向, 电场方向：
the magnetic field peaks in strength immediately after switching polarity.
在转换相对极向后, 磁场的磁力立刻达到了最高点。
1.2
- the state of having two opposite or contradictory tendencies, opinions, or aspects（倾向, 观点, 方面）截然相反, 截然对立：
the polarity between male and female
男性和女性的对立
count noun the cold war's neat polarities can hardly be carried on.冷战的纯粹截然对立状态难以持续。
1.3
- Biology the tendency of living organisms or parts to develop with distinct anterior and posterior (or uppermost and lowermost) ends, or to grow or orientate in a particular direction【生】反向性, 极性。