Maybe they sense slight variations in the rate of change in the magnetic field, much like a hiker reads tightly spaced lines on a topographic map to discern a distinctive canyon.
也许它们感受磁场变化速度的细微变化，就像登山旅行者参照地形图上密密麻麻的线段以辨别一个与众不同的峡谷。
Maybe they sense slight variations in the rate of change in the magnetic field, much like a hiker reads tightly spaced lines on a topographic map to discern a distinctive canyon.
也许它们感受磁场变化速度的细微变化，就像登山旅行者参照地形图上密密麻麻的线段以辨别一个与众不同的峡谷。
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