So the increase of 12 years in maximum life expectancy during the 20th century was just one-third as large as the increase in average life expectancy during the period (36 years).

因此，20世纪最长寿命12年的增长幅度只不过是同期平均寿命增幅(36年)的三分之一。

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The average risk of structure in construction period is far higher than one in use period. To make the risk analysis study is very necessary in the construction of large-span cable-stayed bridge.

结构在施工期的平均风险远远高于使用期，开展大跨度斜拉桥施工期间的风险分析研究是十分必要的。

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Add to that an average period of unemployment for boomers of nearly one-full year and you have a large and increasingly desperate group of people competing for twenty-first century work, often equipped with only twentieth century skills.

FORBES: 10,000 Boomers a Day Need Jobs: Getting Back to Where We Once Belonged