Viruses change,or mutate, so flu vaccines must be reformulated each year to target the most common threats.

VOA: special.2009.03.04

Some common fruit trees such as sweet cherries and McIntosh apples have to be grafted.

VOA: special.2010.05.18

But ischemic strokes are more common, and doctors may be able to treat them.

VOA: special.2009.09.22

To hear an oriole sing May be a common thing Or only a divine It is not the bird Who sings the same unheard, As unto crowd.

VOA: special.2010.07.18

The ankle was the most common body part to be injured.

VOA: special.2009.12.09

"People tend to congregate and be together and the way the common cold virus is transmitted from one person to another is through handshakes,through sneezing, or coughing on one another."

VOA: special.2011.04.20

It is testimony to what can be achieved by a transatlantic community that acts with a clear sense of common purpose,".

VOA: standard.2009.04.04

"A common threat is if you leave we're going to report you to immigration and you'll be arrested, you'll be kept in prison for a long time."

VOA: standard.2010.05.24

A spokeswoman for NATO Secretary General Jaap de Hoop Scheffer says he regrets the Russian decision and hopes talks can be rescheduled to discuss many subjects of common interest.

VOA: standard.2009.05.05

No,it's not going to be that. But it does need to basically provide the common talking points so that allied leaders, allied presidents and prime ministers, have on one sheet of paper,one page, a set of common talking points that they can speak from to their people to explain why the alliance matters.

VOA: standard.2010.06.11