单词	polar bear
释义	polar bear noun A large white arctic bear which lives mainly on the pack ice. It is a powerful swimmer and feeds chiefly on seals. Thalarctos maritimus, family Ursidae. If you doubt that, consider which bear will live more effectively if transported to the tropics - a polar bear or a black bear.... A hundred other wildlife species, from polar bears to Arctic foxes, also rely on this unique wild jewel. Multiple bear species, including polar bears and grizzlies, have been crossbred in zoos.
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