But in nature there are always constraints because resources and energy are not unlimited.

但是自然界中总是存在种种限制，因为资源和能量不是无限的。

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Significant advances have been made in the understanding of the biological and chemical nature of olfaction, but many fundamental questions have yet to be answered.

在理解嗅觉的生物学和化学性质方面已经有了重大进展，但许多基本问题仍有待回答。

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Many species are similar enough that hybrid offspring are possible and may often occur in nature, but for the majority of species, this rule generally holds.

许多物种非常相似，因此有可能杂交繁衍出后代，而且这种情况可能经常在自然界中发生；但对于大多数物种来说，这一规则大体适用。

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They say the roots develop better. But Jeffrey Dinslage, president of Nature Hills Nursery in Omaha,Nebraska, points out that bare-root roses come without soil.

VOA: special.2010.06.15

It can be the grandness of the Grand Canyon, But it can also be this little tiny nature is in that same little tiny plot.

所以自然中的灵性可能是像大峡谷一样的雄伟，也可能是这块小小的,方块里的微型自然界。

普林斯顿公开课 - 人性课程节选

It's crucial, as I say, and I'm going to be coming back to it, but it's just a point I want to make in passing about the nature of theory now.

这一点至关重要，而且我以后还会再次提到，但现在关于理论的本质我就谈到这里。

耶鲁公开课 - 文学理论导论课程节选

Evolution takes time, but unlike in nature, business evolution often runs stagnant without a structured and purposeful approach.

FORBES: Should Sales Own Customer Experience?

The answer to this question lies not just in the presence of a recovery, but also in its nature.

FORBES: Inclusive Crises and Exclusive Recoveries?

The Japanese attack at Pearl Harbor, on December 7, 1941, was a violent shock, but only in the nature and extent of the destruction: by then, most Americans had come to believe that the country would be dragged into the global war with Fascism one way or another, though their eyes were fixed on Europe, not the Pacific.

NEWYORKER: Coming Apart