Therefore the next distinction was made between animals that maintain a constant body temperature , called homoiotherms , and those whose body temperature varies with their environments , called poikilotherms 因此另一个不同点（区分方法）被提出，能保持体温恒定的动物称之为恒温动物,那些体温因周围环境（温度改变）而改变的动物,叫做变温动物（也叫冷血动物）
2.
Furthermore , many invertebrates that live in the depths of the ocean never experience change in the depths of the ocean never experience change in the chill of the deep water , and their body temperatures remain constant 此外,很多住在深海的无脊椎动物（变温动物）在寒冷的深水中从未经历过温度变化，因为海洋深处的冰冷海水的温度从没变化过，所以他们的体温也是恒温的。
