Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: special.2010.06.23

The integral of one over a quantity is the natural log.

这种形式的积分结果,是自然对数。

麻省理工公开课 - 热力学与动力学课程节选

The emphasis on the individual is just another way of saying, again unlike Aristotle, that no one has natural authority over anyone else.

个体的重点在于,与亚里士多德所说不同，没有人拥有高于他人的自然权威。

耶鲁公开课 - 政治哲学导论课程节选

Natural gas is considered the cleanest of the fossil fuels, the fuels created by plant and animal remains over millions of years.

VOA: special.2009.10.23

This is introducing a gene, it's a natural gene but it's not - it's a natural gene that's found in humans and is actually expressed all over your body in different levels, but you're concentrating it or over expressing it in one particular region of tissue in order to have a particular effect.

通过导入一个基因,这是一个天然基因但--,是一种于人体内发现的天然基因,在全身细胞中都有不同程度表达,但需要集中在组织的某一特定区域,表达或过表达,才能达到特定疗效

耶鲁公开课 - 生物医学工程探索课程节选

UNESCO's World Heritage list includes over nine hundred natural or cultural places considered to have universal value.

VOA: special.2010.11.03

A blue-gray haze from natural and now manmade sources hangs over them like smoke.

VOA: special.2009.09.28

"I'm Cari Corrigan. I'm a geologist over at the Natural History Museum.

VOA: special.2010.07.28

The Russian national budget relies heavily on taxes from the sale of oil and other natural resources, and oil prices have dropped sharply over the past year.

VOA: standard.2009.05.25

"It's natural that in parliament people agree or disagree and negotiate and bargain, especially over election laws, which are the most major laws that a parliament passes."

VOA: standard.2009.10.26

Energy has become a major concern in several Western countries, after a dispute between Ukraine and Russia over prices led to major natural gas shortages in Europe earlier this year.

VOA: standard.2009.10.23