We are still not sure how, but this compass interacts with the Earth's magnetic field, helping the bacteria to navigate through sediment to the best feeding grounds.
2
地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。
The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.
3
地球内部的熔铁围绕其核心的超高温固体铁核流动，由此产生了地球磁场。
The planet's magnetic field is generated by the motion of molten iron flowing around a superhot, solid iron core.
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