Most young women feel a biological need to procreate.

大多数年轻妇女觉得生儿育女是一种生理需要。

《柯林斯英汉双解大词典》

In recent years, a growing body of research has shown that our appetite and food intake are influenced by a large number of other factors besides our biological need for energy.

近年来，越来越多的研究表明，我们的食欲和食物摄入量除了受对能量的生理需求影响外，还受到许多其他因素的影响。

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For languages, the explanation may be a cultural rather than biological need to distinguish populations.

对于语言，理由可能是区分人群这样一个的文化上而非生物学上的需要。

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Which is just to say, we need to offer a biological/physical explanation of what goes on in near-death experiences.

那也只不过是说,关于濒死体验我们需要给出,一个生物学或物理学的解释

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For languages, the explanation may be a cultural rather than biological need to distinguish populations.

ECONOMIST: Languages and species evolve in surprisingly similar ways

"We aren't sure why activity primes your body for sleep so well, but it's likely a combination of factors, including lowering your core body temperature, increasing the sleep-promoting hormone melatonin and supporting a biological need to restore energy levels and repair cells and tissues when you sleep, " Cardinal says.

CNN: How to fix health problems with exercise

Biological interventions need not be draconian, and it's never too early to stop the rot.

CNN: Opinion: Unlocking crime using biological keys