This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.

这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。

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Sony used racoon hair brushes to daub magnetic powder over the paper to produce what it cally "SONI TAPE", starting its history as an audio-video products maker.

索尼使用浣熊毛做成的刷子将磁粉涂抹在纸上，生产出称作“索尼带”的东西，开始了其作为音像产品制造商的历史。

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One of these was loadstone which is basically a chunk of naturally occurring iron which has somehow in the course of the earth’s long history obtained a magnetic orientation.

这些矿石中的一种负载石在漫长的地球演变过程中变成了具有磁场能力的块状的大型天然铁。

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In addition to the magnetic pull of the casinos, there is the history that attracts.

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Those who have a family history of cancer significant enough to make them "high risk" should get a magnetic resonance imaging scan in addition to a mammogram, Dr. Monsees says.

WSJ: Dense Breasts Pose a Dilemma in the Search for Breast Cancer