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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With soy farmers, loggers and urban settlements advancing, cataloguing and preserving ancient Amazon sites had become a race against time.

随着种豆的农民、伐木工以及城市居民不断进步，编录并保护古代亚马逊遗址已经成为了一场和时间较量的竞速赛。

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Blacks and Whites are important users of urban parks and forests, and race continues to be an important factor in urban park and forest participation and landscape preference.

黑人和白人都是城市公园和森林的重要使用者，而且种族仍是在城市公园和森林参与和景观首选项中的一个重要因素。

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In November, DARPA put street-level robots to the test in its Urban Challenge, a race of 12 autonomous cars through simulated city streets populated by obstacle cars.

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But other Democratic front runners accused Bloomberg of buying a race and interfering in the heavily urban district that also includes some Chicago suburbs and rural areas.

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DARPA, after all, is the ultra-forward-thinking Pentagon agency that hosted the Grand Challenge in 2006 and 2007, an autonomous car race across the Mojave desert, as well as the Urban Challenge, a 2008 event that challenged self-driving cars to negotiate a cityscape complete with obstacles and traffic.

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