The group says it could be hard to stop experimental organisms from entering the natural environment.

VOA: special.2010.07.20

This could be a serious problem. The shield protected the spacecraft from burning up from the extreme heat of re-entering the Earth's atmosphere.

VOA: special.2009.06.17

He later said it represented artists from the past entering his body and mind to guide him.

VOA: special.2010.04.14

Local authorities will be prohibited from entering Russian property without consent of the Russian border patrol chief.

VOA: standard.2009.04.30

All U.N.personnel have now been barred from the entering the town.

VOA: standard.2009.08.27

The amendment would prevent the U.S.Export-Import Bank from entering into any deals with foreign companies that significantly contribute to Iran's refined petroleum resources, part of efforts to pressure Iran to stop its uranium enrichment program.

VOA: standard.2009.06.23

We're at a point now where some really important recent discoveries have not answered all our questions, but have certainly helped take us into some new directions and really open up a new chapter in the search for additional options to prevent HIV Those recent discoveries include anti-bodies found in some HIV positive people that prevent the AIDS virus from entering cells.

VOA: standard.2010.07.15