| 单词 | 两栖纲 |
| 释义 | 〔crossopterygian〕A member of the Crossopterygii, a group of bony fishes with paired, rounded fins that are extinct except for the coelacanths and are regarded as ancestors of amphibians and other terrestrial vertebrates.总鳍鱼：一种总鳍目鱼，长有成对的圆形鳍，除了空鳍鱼类的鱼之外现已全部灭绝，被认为是两栖纲动物和其它陆生脊椎动物的祖先〔amphibian〕A cold-blooded, smooth-skinned vertebrate of the class Amphibia, such as a frog or salamander, that characteristically hatches as an aquatic larva with gills. The larva then transforms into an adult having air-breathing lungs.两栖动物：一种两栖纲的皮肤光滑的冷血脊椎动物，如蛙或蝾螈，此类动物的特征是有鳃的幼虫在水中孵化，然后逐渐转变成用肺呼吸的成虫 |
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