The World Health Organization, the United Nations health agency, uses a system of six phases to warn of possible influenza pandemics.

VOA: special.2009.05.06

This week,we tell about the biggest system of freshwater lakes in the world, the Great Lakes between the United States and Canada.

VOA: special.2009.11.11

For example, the Great Barrier Reef in Australia is the largest coral reef system in the world.

VOA: special.2009.04.22

During World War One, Margaret Brown went to France to help with the American medical ambulance system.

VOA: special.2010.03.08

Leaders of the major developed and developing economies discussed ways to fix the world financial system.

VOA: special.2009.10.02

But the lending organization warns that strong policies to supervise and support the financial system are needed if the world economy is to fully recovery.

VOA: special.2009.04.24

"The brain-machine interface is a system that allows disabled people, people suffering from physical disabilities to communicate with external world and also to control devices."

VOA: special.2011.04.04

Today,Aravind Eye Care System is the largest eye care provider in the world.

VOA: special.2010.04.27

So the system is not foolproof." "But overall,it is in our view, the better system than anywhere else in the world because it gives average citizens an opportunity to listen to the evidence and make independent judgments the government is not part of."

VOA: special.2009.08.31

But Blatter said the current system could not be changed during the World Cup, which is currently approaching the quarterfinals in South Africa.

VOA: standard.2010.06.29

President Obama surprised the world last Thursday when he announced plans to cancel a missile defense system in Europe proposed by the Bush administration.

VOA: standard.2009.09.24

The $150 million system is the second largest of its kind in the world.

VOA: standard.2010.07.30

Says that in the ancient world, Angkor was known for its sophisticated water system.

VOA: standard.2010.04.05

Mr.Zuma said the global economic crisis highlighted the need to reform the international financial system and multilateral lending groups like the World Bank and International Monetary Fund.

VOA: standard.2009.06.10