in a way that amphibians could not. 在干旱的土地上繁衍
Lacking water, most amphibians struggled. 由于缺水 多数两栖动物苦苦挣扎
No matter what great heights amphibians reached in their conquest of land... 不论两栖动物 在征服陆地的过程中达到如何的高度
because there's something all amphibians need to raise their young. 因为所有两栖动物养育后代 都需要一样东西
amphibians have survived for over 350 million years. 但两栖动物已在地球上生存 超过3.5亿年
swamplands remain a stronghold for amphibians. 沼泽仍然是两栖动物的根据地
Amphibians, reptiles, mammals, and birds. 两栖动物、爬行动物 哺乳动物以及鸟类