In MRI, the patient is placed in a strong magnetic field that causes some of his body's atomic nuclei, which act like tiny magnetised spinning tops, to align themselves with the field.

MRI是将患者置于某一强磁场中，该磁场可让患者机体原子核（其运动类似于磁化的陀螺）顺着磁场方向排列。

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Considering atomic anharmonic vibration, the authors have figured out the expression of free energy and relaxation of single-domain ferromagnetic granule in magnetic field.

结果表明：原子的非简谐振动会影响单畴铁磁粒子的自由能，但是不会影响弛豫时间。

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The use of laser cooling atomic beam technique can greatly reduce this aberration and makes the magnetic lens a useful tool in the field of atomic optics.

应用激光冷却技术能使这一影响减小，从而使磁透镜在原子光学领域得到更广泛的应用。

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