Time Magazine has released a list of this year's top 50 inventions. The breakthroughs fall into 10 categories, such as technology, transportation, health and medicine, bioengineering and green energy.

美国《时代》杂志近日评出年度50大发明，榜单被分为“科技产品”、“交通工具”、“健康医药用品”、“生物工程”、“绿色能源”等10个类别。

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Cost,including transportation, may decide the success of the new technology.

VOA: special.2009.12.01

The story of the American West is in part the story of advances in technology and transportation, including air conditioning and the highway system, which made it possible for people to live comfortably in more places.

CNN: Highways unleash America's wandering, restless spirit

An expert on urban transportation technology, Sperling says the most obvious change consumers can expect in future transportation is increased prevalence of hybrid and pure-electric vehicles.

FORBES: How Obama's Fuel Standards Are Shaping The Future of Transportation

The Port of Pittsburgh Commission got involved in transportation technology because we saw a gap.

WHITEHOUSE: A Rising Tide Lifts All Ships