Scanning and matching the rocks' magnetic signatures, which require more funds to complete, are the crucial complement.

扫描并匹配这些岩石的磁性签名需要更多的经费来完成，这是至关重要的补充。

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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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Broca's heirs, though, now have a range of new techniques with which to investigate the question. The best-known is a way of scanning the brain called functional magnetic-resonance imaging (fMRI).

布罗卡的后继者尽管现在有了一些新的技术来应对这些问题，其中最著名的一种是扫描大脑的的技能型磁共振成像技术(fMRI)。

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Daniel Langleben, of the University of Pennsylvania, in Philadelphia, uses a brain-scanning technique called functional magnetic-resonance imaging to probe his subjects' honesty.

ECONOMIST: Lie detection

Scanning their brains using functional magnetic resonance imaging, the scientists found that a region involved in language processing - the temporal lobe, part of the prefrontal cortex - was activated during verbal learning in rested patients.

BBC: Brain 'battles sleep deprivation'

However, MRI requires large magnetic fields for successful scanning - bigger than those commonly used in industry.

BBC: Study into health impact of MRI