The coils in the scanning apparatus detect these magnetic changes, which are used to build up a map of the part of the body being examined.

扫描仪上的线圈探测到这些磁场变化，并以此构建出患者受检部位的图谱。

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The magnetic changes of the samples prepared from ferrous Wiley Mill have been studied with the economic and fast method of Gouy balance.

用经济、快速的古埃天平法，研究了铁质粉碎机制备试样的磁性变化。

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At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

在地球表面，可以通过改变地球磁场强度来检测这些风暴。

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The technology allows researchers to measure magnetic-field changes around the brain while a baby sits under what looks like a beauty-salon hair dryer.

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This could pave the way for ultrasensitve sensors that can detect minute changes in magnetic fields and gravity.

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Shock waves from the impact would travel through the planet and disrupt the crust on the other side, causing changes in the magnetic field recorded there.

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