two poles that have opposite and equal electrical charge or magnetic force, with a space between them

Geomagnetic South Pole represents the axis of the Earth's magnetic dipole. 地磁南极代表地球磁偶极子的轴。

a molecule with an area of negative charge and an area of positive charge that are separated

Many molecules (such as those of water) are electric dipoles, meaning that they have a partial positive charge at one end and a partial negative charge at the other. 许多分子（例如水分子）都是电偶极子，也就是说分子的一端含部分正电荷，另一端含部分负电荷。

a simple type of radio aerial (= a structure that receives or sends out radio signals) that is shaped like the letter T

With most FM radio stations today, a vertical dipole gives as much signal as a horizontal one. 对如今大多数的调频广播电台来说，垂直偶极子天线和水平偶极子天线发出的信号的强度是一样的。