The gills of fishes are analogous to the lungs in terrestrial animals.

鱼类的鳃与陆上动物的肺类似.

《现代汉英综合大词典》

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

北极熊虽然会游泳, 但也是陆栖动物.

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The gills of fishes are said to be analogous to the lungs in terrestrial animals.

鱼类的鳃与陆上动物的肺可说成是类似的.

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