换句话说，倒退是可能的，但只可能发生在相对较近的进化史上。

In other words, throwbacks are possible, but only to the relatively recent evolutionary past.

youdao

我们的地球相对来说比较小，绕赤道一周只有24902英里。

Our planet Earth is comparatively small, with only about 24,902miles around the equator.

youdao

玩耍可以让一只小动物探索环境并在相对安全的环境中练习技能，因为周围的成年动物通常不期望幼崽应对威胁或捕食者。

Play allows a young animal to explore its environment and practice skill in comparative safety since the surrounding adults generally do not expect the young to deal with threats or predators.

youdao

There are only things that are circular to a greater or lesser degree.

只存在相对的圆的东西

耶鲁公开课 - 死亡课程节选

What's happened actually if we base it in the last 25 years since the early '80s We've just had two recessions and they've been very mild by historical standards and...two--now three long expansions in between.

实际上是什么情况呢,80年代初期以来，这25年当中,我们只经历过两次经济衰退,而且在历史上算是相对轻微的,其间则是两，三次长时间的经济增长。

斯坦福公开课 - 经济学课程节选