A few American cities have taken European-style steps to make streets safer for cycling, most notably Portland, Oregon, which has used most of the above ideas.

一些美国城市采取了欧洲风格的措施，以此让骑自行车的人的街道更安全，取得最显著成效的是俄勒冈州波特兰市，该城市已使用上述方法。

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The process used in the new experiment is "quite inefficient, " Shoukhrat Mitalipov of the Oregon National Primate Research Center in Portland told reporters Wednesday.

波特兰市的俄勒冈国家灵长类研究中心的米塔李波夫（Shoukhrat Mitalipov）星期三对记者说，新试验使用的方法效能非常低下。

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Birk used to work for the city of Portland. Then she started doing consulting work.

Birk曾经是波特兰市的公务员，然后她从事了咨询工作。

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The idea is to replace some of the portland cement traditionally used in making concrete.

VOA: special.2009.12.01

This synthetic chalk could substitute for some of the Portland cement now used in construction.

FORBES: Thought Leaders

Other data used in the rankings came courtesy of Portland, Ore. researcher Bertrand Sperling.

FORBES: The South Rises Again

Other data used in the rankings came courtesy of Portland, Oregon researcher Bertrand Sperling.

FORBES: Magazine Article