The weasel and the lemming begin to change color; as the winter deepens, their coats will turn snow-white.
黄鼠狼和旅鼠开始改变颜色，随着深冬的来临，它们的毛皮将会变成雪白色。
The Arctic fox is disappearing from the southern edge of the tundra as larger, more dominant red foxes move northward and lemming prey grow less abundant as temperatures warm.
由于体型较大且较具优势的红狐北移，北极狐在苔原南部的数量正在下降，而且他们的猎物旅鼠也因为气温上升而越来越少。
North American lemming having a white winter coat and some claws much enlarged.
冬季为白色皮毛且一些爪非常大的北美洲旅鼠。
North American lemming having a white winter coat and some claws much enlarged.
冬季为白色皮毛且一些爪非常大的北美洲旅鼠。
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