1. With their large, slightly webbed front paws, polar bears are powerful swimmers. Native to the Arctic, the bears have been spotted swimming hundreds of miles out to sea.
拥有硕大，细长的蹼的前掌的北极熊是游泳高手。原产于北极的北极熊能在上百英里外发现海洋。
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2. With their large, slightly webbed front paws, polar bears are powerful swimmers. Native to the Arctic, the bears have been spotted swimming hundreds of miles out to sea.
