他向我们展示了动物是一个大家庭，每一种动物都在慢慢地变化，以适应生活环境。
He showed that animals are all one big family and that every kind of animal changes slowly to match the place where they live.
这两套不同的理论都意味着，适应不同的栖息地生活环境的这一过程只发生了一次。
Both of these scenarios imply that specialization to each niche occurred only once.
也可能都经受了许多困难和挑战，因为既要学习一门复杂的东方语言，又要适应迥异的生活环境，更要了解完全不同的文化，我本人年轻时就曾赴国外留学，对此深有体会；
You must have gone through a difficult time, trying to learn a foreign language and at the same time adapting to a totally different culture and environment.
应用推荐