longitudinal [magnetic] field

例句：

1. 1.The longitudinal magnetic field is responsible for the movement of electrons in a conductor.
   纵向磁场负责导体中电子的运动。
2. 2. In the longitudinal magnetic field, the north pole of the magnet faces towards the south pole.
   在纵向磁场中，磁铁的北极面向南极。
3. 3. The longitudinal magnetic field can be used to detect and measure magnetic fields.
   纵向磁场可以用来检测和测量磁场。