北极熊虽然会游泳，但也是陆栖动物。

Although they can swim, the polar bears are terrestrial animals.

水栖动物获得池塘，陆栖动物获得某种笼子。

Aquatic animals get tanks, land animals get enclosures of some kind.

陆栖动物据信由海栖动物进化而来。

Land animals are believed to have developed from sea animals.

它们在血液中储存氧气的能力也比陆栖动物强。

They also have a greater capacity than land animals to store oxygen in their blood.