field direction的用法和样例：
例句
- They seem to use both the intensity and direction of the magnetic fields to navigate.
它们看起来即使用磁性的强度又利用磁场方向来航行。 - 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.
一旦电流受到极化，则它在流经磁场方向与其相同的材料时较容易通过，而较难通过磁场方向与它相反的材料。
