field direction的用法和樣例：
例句
- They seem to use both the intensity and direction of the magnetic fields to navigate.
它們看起來即使用磁性的強度又利用磁場方向來航行。 - Once an electric current is polarized, it flows more easily through a material whose magnetic field is parallel with its polarization than through one that is antiparallel.
一旦電流受到極化，則它在流經磁場方向與其相同的材料時較容易通過，而較難通過磁場方向與它相反的材料。
