The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

So unless we see the big countries in East Asia rebalancing away from exports and toward domestic demand, we are not going to generate a self-sustaining global economic recovery."

VOA: standard.2010.02.26

His comments reflected what other officials have said that ending the F-22 program is just one part of the effort to shift the focus of U.S.defenses away from what they see as the relatively remote possibility of a war with a major power and toward the types of smaller-scale conflicts of recent years.

VOA: standard.2009.07.21