The magnitude of the vector is the strength of the magnetic field, and the direction of the vector is the field's direction.
矢量的大小就是磁场的强度，矢量的方向就是磁场的方向。
Direction Field
原声例句
Crash Course Physics 速成课物理
英语百科
Slope field
（重定向自Direction Field）
In mathematics, a slope field (or direction field) is a graphical representation of the solutions of a first-order differential equation. It is useful because it can be created without solving the differential equation analytically. The representation may be used to qualitatively visualize solutions, or to numerically approximate them.
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