It uses an MRI or magnetic resonance imaging machine to look for abnormalities in the brain.

VOA: special.2010.12.21

So on your computer's hard drive are again, a whole bunch of tiny magnetic particles aligned this way or this way.

因此，你的电脑硬盘是完全是,有一簇按照这种方式排列的磁性粒子。

哈佛公开课 - 计算机科学课程节选

You've got a magnetic field, maybe even magnetic susceptibility, the electric field. We're not going to worry about these magnetic fields or electric fields in this class So, pretty much we're going to focus on this set of variables here.

你也会引入磁场，或许甚至磁化率，以及电场，我们这堂课不需要关心,这些磁场或,电场之类的东西,基本上我们只关注,这里的一组变量。

麻省理工公开课 - 热力学与动力学课程节选