He even spent some time traveling around America on freight trains.

VOA: special.2010.05.21

You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.

你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动

耶鲁公开课 - 基础物理课程节选

At the time of Endeavour's launch, NASA says the International Space Station was traveling at a speed of about eight kilometers-per-second, above western Romania.

VOA: standard.2010.02.08

Some critics have questioned why the president is traveling at a time when so many pressing matters are before him not just Afghanistan, but also the U.S.economy and his ongoing campaign for health-care reform.

VOA: standard.2009.11.12

And I think that will stand the test of time." State Department officials traveling with Secretary Clinton say she also discussed the Group of Eight leading industrialized nation's That money is in addition to emergency humanitarian programs, and is meant to fight hunger by enabling small farmers to produce more of their own food by improving productivity.

VOA: standard.2009.08.16