Water and organic materials are necessary for life as we know it.

VOA: special.2010.05.25

Telomeres are necessary for a cell to divide.

VOA: special.2009.10.07

"An empowered group of ministers has been set up to study whether any changes in the law are necessary.

VOA: standard.2010.06.10

He also explained that he thinks more troops are necessary to support the country's nascent police and military.

VOA: standard.2009.09.29

"He should have said that he is ready to apply, to implement all the obligations that are necessary for the success of negotiations,"

VOA: standard.2009.11.26

While not stipulating dollar amounts of U.S.military aid, it authorizes such sums that are necessary to help the country deal with security needs.

VOA: standard.2009.09.24

Mr.Medvedev said new missile technology will be developed in full accordance with any new arms agreements reached with Washington, but that other weapons are necessary.

VOA: standard.2009.12.25

"We will take what steps are necessary to prevent that."

VOA: standard.2010.05.28

But they also made it clear that they are willing to act alone, if necessary, to pass a health care bill.

VOA: special.2010.02.27

But a recent study warned that more children than necessary are being exposed to radiation this way.

VOA: special.2009.10.28

After completing their studies, Sudanese students are expected to return home with the skills necessary to help deal with the complex causes of conflict in the country.

VOA: special.2009.01.28

But some experts believe that many of the C-sections are not medically necessary.

VOA: special.2009.11.24

Its nuts and bolts are its basic, necessary elements.

VOA: special.2009.11.01

"The blunt reality is that there will be dwindling appetite and patience in the US Congress -- and in the American body politic writ large -- to expend increasingly precious funds on behalf of nations that are apparently unwilling to devote the necessary resources or make the necessary changes to be serious and capable partners in their own defense."

VOA: special.2011.06.11

Some cesareans are medically necessary. But in other cases, women just want the convenience of knowing when they will give birth.

VOA: standard.2010.06.30