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untiringly    
ad. 不疲倦地;不屈不挠

不疲倦地;不屈不挠


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  • Polar bear - Wikipedia
    The polar bear is the largest extant species of bear and land carnivore by body mass, with adult males weighing 300–800 kg (660–1,760 lb) The species is sexually dimorphic, as adult females are much smaller The polar bear is white or yellowish-furred with black skin and a thick layer of fat
  • Polar bear | Description, Habitat, Facts | Britannica
    Polar bear, great white northern bear found throughout the Arctic region The polar bear is the largest and most powerful carnivore on land, a title it shares with a subspecies of brown bear called the Kodiak bear
  • Polar Bear photos, facts, and map | National Geographic Kids
    Polar bears live along shores and on sea ice in the icy cold Arctic When sea ice forms over the ocean in cold weather, many polar bears, except pregnant females, head out onto the ice to
  • Polar Bear | WWF - World Wildlife Fund
    Polar bears are key to Arctic ecosystems Discover WWF’s efforts to combat sea ice loss and safeguard polar bear populations
  • Top 10 facts about polar bears - WWF
    Discover fascinating facts about polar bears and find out about our work with tracking polar bears in the Arctic
  • Polar Bear - National Geographic
    Polar bears roam the Arctic ice sheets and swim in that region's coastal waters They are very strong swimmers, and their large front paws, which they use to paddle, are slightly webbed
  • Polar bear - WWF
    Their thick white coat and a layer of fat keep them warm and camouflaged in their harsh Arctic environment Polar bears are classified as vulnerable There are between 22,000 to 31,000 polar bears left in the wild, but climate change is making life tough for these impressive, powerful predators
  • Bear - Wikipedia
    Two lineages evolved from U minimus: the black bears (including the sun bear, the Asian black bear, and the American black bear); and the brown bears (which includes the polar bear)
  • 10 facts about polar bears! - National Geographic Kids
    Rising global temperatures means that sea ice is melting earlier and forming later each year, leaving polar bears less time to hunt for food But the good news is you can help these amazing animals!
  • Polar Bears: Species Facts, Info More | WWF. CA
    The polar bear’s Latin name, Ursus maritimus, means “sea bear ” It is an apt name for this majestic species, which spends much of its life in, around, or on the ocean — predominantly on sea ice As sea ice melts, more and more polar bears can be found resting along Arctic coastlines





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