Adjective:

1. relating to or characteristic of animals of the class Amphibia

2. operating or living on land and in water;

   "amphibious vehicles"
   "amphibious operations"
   "amphibious troops"
   "frogs are amphibious animals"
   

amphibianadj.两栖类的；水陆两用的n.两栖动物；水陆两用飞机；水陆两用车

aquaticadj.水生的；水中的；水上的n.水生动物；水草

terrestrialadj.陆地的；陆生的；地球的n.地球生物

1. They proposed a heavy and concentrated amphibious assault.
   他们计划进行一次猛烈而集中的两栖攻击。
2. At last I found this amphibious creature.
   最后我找到了这个两栖动物。