The continents drifted. The mammals rose.

然后大陆漂移，哺乳动物随之而生。

South America became an island continent, drifting through the ancient ocean while its inhabitants lived on in isolation.

南美洲变成了一个岛屿大陆，漂流在古老的海洋中， 而其居民则与世隔绝地生活。

Or there's the Eocene, more than 34 million years ago, a hothouse time during which the continents drifted into their present configuration.

或者是超过 3400 万年前的始新世，这是一个温室时代，在此期间大陆逐渐变成了现在的形态。