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At these altitudes, mammals must feed regularly to keep warm.
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At these altitudes, mammals must feed regularly to keep warm. 海拔如此之高 哺乳动物必须定时进食以保持体温

And the radio collars show they now regularly stray into this unfamiliar landscape.
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And the radio collars show they now regularly stray into this unfamiliar landscape. 无线电项圈显示它们常常误入这片陌生的土地

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