一项历时五年的奥运安保计划本周在温哥华初具雏形。
An Olympic security plan five years in the making is taking shape in Vancouver this week.
并且，历时五年多的艰难行伍生涯开启了他的生命意识。
And the lasted more than five years of difficult enlistment opened his life consciousness.
这个声明基于一项历时五年的参与者有500位老人的研究。
The claim is based on a study that followed more than 500 elderly individuals for five years.
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