Currents create magnetic fields, leading to a third variable, magnetic flux, which characterises the field's strength.
电流产生了磁场，导致第三个变量的产生-磁通量，它表示磁场的强弱。
"We've always known that the Earth's magnetic field is variable, constantly evolving in time," Raymond said.
“众所周知地球的磁场是变化的，无时无刻不在变化”雷蒙德教授说。
More precisely it tells you that what you might have learned about electric fields deriving from electric potential becomes false if you have a variable magnetic field.
更精确地说，电势产生电场，这一观点是错误的，如果忽略变化磁场的存在的话。
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