The difference in the apparent position of the cosmic masers lets astronomers measure their distance from the Earth.

VOA: special.2009.01.20

Johanna is from Germany. "The biggest difference for me is the relationship to the teachers.

VOA: special.2009.11.05

The difference between what Americans sell to other countries and what they buy from abroad reached almost $50 billion, its highest figure since late 2008.

VOA: standard.2010.08.11

Alice,a tourist from France, says she notices the difference in atmosphere among the people.

VOA: standard.2010.04.12

Their price has remained stable. "The main difference I have seen is people are moving from 22 carat gold jewelry to diamond jewelry, maybe what they say is true is diamonds are forever, and diamonds always is a lady's best friend,".

VOA: standard.2009.10.17