In the 20th century, life expectancy in wealthy nations increased by as much as 30 years.

VOA: standard.2010.04.08

There were three influenza pandemics in the 20th century.

VOA: standard.2009.05.14

In this sense, he says the pattern appears to be similar to that,which occurred during the three 20th century pandemics.

VOA: standard.2009.05.14

"In terms of their development, they have remained in the 20th and even the 19th century."

VOA: standard.2010.02.03

But it wasn't always so. The rise of the soybean in America is a 20th-century phenomenon.

VOA: standard.2010.02.01

"Today,we've taken another step forward by - in leaving behind the legacy of the 20th century while building a more secure future for our children."

VOA: standard.2010.03.26

After the war, the town fell into disrepair but was rebuilt by billionaire John D.Rockefeller in the early 20th century, to preserve the atmosphere and ideals of 18th century America.

VOA: standard.2010.07.03