All this presupposes one essential detail, says Atholl Anderson, professor of prehistory at the Australian National University: the Lapita had mastered the advanced art of sailing against the wind.

澳大利亚国立大学的史前学教授阿索尔·安德森表示，这一切都以一个重要的细节为前提：拉皮塔人已经掌握了逆风航行的高级艺术。

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One essential ingredient is ease of integration.

一个重要的组成部分就是易于集成。

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One essential application, that every computer user needs, is a decent word processing software.

一款像样的文字处理软件是每个电脑用户的必备品之一。

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It can be honed but those are some of the skills for a consumer internet company and one that is growing this quickly that is just essential.

是可以通过磨练而得的,但是对于增长如此迅速的,客户导向型互联网公司来说,有一些技能是不可习得的。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选

So, they've lost one of the essential characteristics of these cells that are the same that I talked about earlier.

所以红细胞已经失去了,先前我讲过的,细胞共同属性之一

耶鲁公开课 - 生物医学工程探索课程节选

It's not one of my essential properties that I'm a person.

作为一个人不是我的基本性质之一。

耶鲁公开课 - 死亡课程节选

One essential question is whether the bank's role would go beyond monitoring to providing financial assistance.

CNN: In Search of a Tougher Cop

If there is one essential element, it is most definitely a good ras el hanout.

WSJ: Cold-Snap Couscous

So far, his government, like its two predecessors, has managed to provide one essential precondition for improvement: macro-economic stability.

ECONOMIST: The chaos at the door