Charles Wortmann at the University of Nebraska-Lincoln says a one-time tillage may be used to correct a problem like aggressive weeds.

VOA: special.2010.09.28

He was also known as a very aggressive hitter, swinging hard and fast at almost any ball.

VOA: special.2010.04.11

The scientists say that studies based on the new genome may help explain, in the short-term, why the organism has been so aggressive.

VOA: special.2009.11.03

Doctor Giuliano says rates of survival five years later showed that the less invasive operation was just as successful as the more aggressive action.

VOA: special.2011.03.23

The scientists say that in the short term, studies based on the new genome may help explain why the pathogen has been so aggressive.

VOA: special.2009.10.20

So could letting another country use a state's territory for aggressive acts against a third state.

VOA: special.2010.06.21

But the secretary called for aggressive action, saying there was more risk in taking small steps.

VOA: special.2009.02.13

She describes the chimps' intelligence, their hunting activities and their sometimes extremely aggressive behavior.

VOA: special.2009.11.18

At the same time, civil rights activists could accuse them of being too aggressive.

VOA: special.2010.07.03

John D.Rockefeller's new company used the same aggressive business methods as Andrew Carnegie.

VOA: special.2010.02.25

Last year, we launched an aggressive new strategy for polio eradication.

VOA: special.2011.01.19

He said he knew that McClellan was not an aggressive general.

VOA: special.2009.09.24

But they can be very aggressive and protective of their territory.

VOA: special.2009.08.19

Some people,for example, are aggressive and always in a hurry.

VOA: special.2009.03.24

They also point to reports of highly aggressive marketing.

VOA: special.2010.07.29