In these 4 years, he interacted with people from different background and nationalities and developed his passion for learning about human behaviour.

在这四年里，他与各种国籍并来自各种背景的人接触，这让他对研究人的行为产生了兴趣。

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As evidenced from the unemployment curve in the last economic cycle, these business cycles can often last 4-5 years.

上一轮经济周期的失业率曲线证明这样的商业周期通常能持续4 - 5年。

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In fact, at the Gray Fossil Site, bones from a saber-toothed cat, camel, elephant and rhinoceros indicate these animals lived in the Volunteer State more than 4 million years ago.

事实上，灰化石遗址（Gray Fossil Site）里犬齿猫科动物、骆驼、大象和犀牛的骨头表明这些动物生活于400多万年前的志愿者州（Volunteer State，即田纳西州）。

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The number of people employed by the UK Border Agency (UKBA) has dropped by about 4, 000 in the past two years, although many of these were not in document-checking roles.

BBC: Fewer fake passports being found by UK's border force

These suggested that rainfall had fallen by 20-30% in the global cooling 4, 200 years ago.

ECONOMIST: Climate change and civilisation

These embellishments, combined with robust job growth (26, 000 in the last five years), 3.4% unemployment and business costs 10% below the national average, make Des Moines number four on our Best Places list.

FORBES: The Rockettes--In Des Moines?