1. Birds are homoiothermal animals, which means they can maintain a relatively stable body temperature.
鸟类是恒温动物，也就是说它们能够保持相对稳定的体温。

2. Some fishes are homoiothermal and can regulate their body temperature in changing environments.
一些鱼类是恒温的，它们可以在变化的环境中调节体温。