In time,railroads became the most popular form of land transportation in the United States.

VOA: special.2010.01.11

It's the time in which but it's the time in which long distance commerce began to take hold, because of transportation revolutions: canals, roads, railroads in particular.

它是一个时期,这是一个远距离商业开始产生影响的时代,主要原因便是运输方式的革新,运河,公路,特别是铁路

耶鲁公开课 - 美国内战与重建课程节选

(Speaking) Institute director Eric Leonhardt says he's had his eye on the dairy herd as a source of transportation fuel for a long time.

VOA: standard.2010.02.23

There are so many people trying to help." That includes American fans who have come forward to donate coaching time, a gym membership, new skis and transportation.

VOA: standard.2010.01.22