Dreaming is associated with rapid eye movement sleep although the biological purpose is still not understood.

做梦的时候，我们是睡着的，但是眼珠却快速的转动，我们至今还未解开这一生理现象之谜。

youdao

Fat has a biological purpose: for most of history it was a sign of vitality and rich men were proud of their rotund wives - look at the ideal of human beauty in a Rubens painting.

脂肪是能派上生物用途的。在历史上的大部分时期，肥胖是生命力的象征，富人们以自己妻子的丰腴为美。不信就看看画家鲁本斯（Rubens）笔下的人体美吧。

youdao

Perhaps as a result of his preoccupation with biological studies, Aristotle was impressed by the idea that both animate and inanimate behaviour is directed toward some final purpose (‘telos’) or goal.

或许由于他的专注于生物学的研究，亚里斯多德有一个印象深刻的概念是无论有生命和无生命的行为都会朝向一些最终目的(telos)前进。

youdao

Though smelling food isn't a survival skill anymore, it still serves a biological purpose.

WSJ: How to Sharpen Your Sense of Smell

In 2008, the 193 Parties to the Convention on Biological Diversity (CBD) decided that no further ocean fertilization activities for whatever purpose should be carried out in non-coastal waters until there was stronger scientific justification, assessed through a global regulatory mechanism.

UNESCO: MEDIA SERVICES