orthopole

例句：

1. 1.The orthopole is the point at which the magnetic field lines converge.
   正极是磁场线汇聚的点。
2. 2. The orthopole is responsible for generating the Earth's magnetic field.
   正极负责产生地球的磁场。
3. 3.The orthopole is used in power transmission and distribution systems.
   正极用于输电和配电系统中。