Even history comes under the same category. The Idea is its essence and inner nature; but, as it appears, everything is under contingency and in the field of voluntary action.

历史一科也属此类，虽说理念构成历史的本质，但理念的表现却入于偶然性与主观任性的范围。

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Sandalwood essence, for example, is a terpene, and the demand for its potent smell means the tree it comes from is becoming rare.

如檀香的精华就是一种萜烯，[font=宋体][size=10.5pt]对其浓烈香味的需求导致了产此香精的檀香树变得稀缺。

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Getting lost is the essence of what travel is about-not knowing what's going to happen and taking it as it comes.

得失是旅途中最本质的一些东西——不知道能得到什么，也无法预料到会失去些什么。

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But here comes the Klaus question: if speed is of the essence, should EU governments that want to see the Lisbon Treaty ratified give Mr Klaus what he wants at the October summit?

ECONOMIST: European politics

The only real methadone comes in the form of mixing a healthier cocktail comprised of long term thinking, a desire to preserve the essence of the brand, and a deep understanding of the longer term consequences of shorter term price actions.

FORBES: Price; Marketing's Most Delicate "P"