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1·The oscillatory current flowing in the coil produces an oscillating magnetic field.

流过线圈的振荡电流产生一个振荡磁场。

2·This is the equivalent of zapping a stationary object with an oscillating magnetic field of the sort used in MRI.

这相当于不断摆动MRI中的磁场，并令其轰击某一静止物体。