For a long time, researchers tried to get round the problem by attempting to re-create the visual processing that goes on in the human cortex.

在很长一段时间里，研究人员试图通过重现人类大脑皮层的视觉处理来绕过这个问题。

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Human beings have used tools for a very long time.

人类使用工具已经很长时间了。

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This nameless person pushed the human race over a historic threshold, for it was in that year that mankind became, for the first time in its history, a predominantly urban species.

这个无名人士让人类的发展跨出了历史性的一步，因为正是在那一年，人类在其历史上第一次成为主要的城市物种。

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The researchers also found tools used by the Clovis culture, a group of human beings who lived at that time.

VOA: special.2009.01.20

It's a fairly recent understanding of Maybe you can just give us a little time line of what human rights means.

这是一个新近的理解,也许你可以先给我们一个时间线索,讲讲人权含义的演变。

普林斯顿公开课 - 人性课程节选

And I think there was a time when that sense of dominion was used as justification for using those resources only to serve human needs.

我想，有一段时间里，这种统治感,被人们当做使用资源的借口,仅仅为了满足人类的需求。

普林斯顿公开课 - 人性课程节选

When Greek and Italian debt yields started to spike we witnessed the rare event of a human-time-scale criticality.

FORBES: Reinhart and Rogoff; and The Dangers of Tipping Points, Real and Otherwise

It won't compete immediately with the monster machines from Illumina because it can decode only a tiny fraction of the human genome at a time.

FORBES: Magazine Article

In such cases, the pig liver is used as a bridge to transplantation, buying the patient time until a human liver can be found.

CNN: Researchers clone pigs