They state that a moving electric charge will generate a magneticfield while a shiftingmagneticfield similarly creates an electric field.
它们表明，变化的电荷会产生磁场，变化的磁场同样能够产生电场。
2
The invention can use the nasal speculum in a magneticfield without generating shifting or influencing magnetic resonance imaging in the operation, and has simple and practical structure.