terrestrial animals

基本解释

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。
The sando's muted color palette was inspired by the typical hues of large terrestrial animals, like elephants and whales.
桑多水怪的暗色调灵感来源于象、鲸等大型地球动物的典型色调。
starwarsfans.cn
Why? Because fish can afford to be lazier than terrestrial animals. Fish essentially float all the time. So their muscles don't work constantly to fight gravity.
为什么呢？因为鱼类的生活比陆地动物“更慵懒”。鱼类一直都浮在水中，所以它们的肌肉不用长期对抗重力作用。