She says people might have difficulty completing an activity if they cannot expect some kind of reward in return.

VOA: special.2009.09.29

If people cannot sense a reward, she says,then they might have difficulty completing an activity.

VOA: special.2009.09.16

A person suffering from MS also may have difficulty seeing well or speaking clearly.

VOA: special.2009.01.06

Experts sometimes have difficulty estimating where,when or how much snow will fall.

VOA: special.2010.01.05

Those who suffer from the disease may also have difficulty naming it.

VOA: special.2009.01.06

Many babies with cleft lip or palate have difficulty feeding.

VOA: special.2009.12.22

"In my home province, we have difficulty in accessing water." "It does not provide sufficient water like what we have here."

VOA: standard.2010.06.02

And scientists often have difficulty explaining what they do in language the public can understand.

VOA: standard.2010.05.04

This is because women have difficulty advocating for themselves and their children.

VOA: standard.2009.09.20

But he may have difficulty building on the 29 percent of the vote he won last month because his presidency is best remembered for financial mismanagement and the arrest of political opponents.

VOA: standard.2009.07.26

But small businesses have been hit hard by the recession and now the difficulty in getting loans.

VOA: special.2009.12.18

Extended periods of stress have been linked to headaches, difficulty sleeping, stomach problems and skin disorders.

VOA: special.2009.03.24

Also,victims of the disease have increasing difficulty learning and storing new information.

VOA: special.2009.09.15

When asthma is most severe, the person may have extreme difficulty breathing.

VOA: special.2009.07.28

The different paths have different levels of difficulty.

VOA: special.2009.12.09

She says they will have great difficulty coping with the increased burden of disease and other health problems.

VOA: standard.2010.01.02

But some foreigners living here say one factor that hurt's South Korea's reputation is the difficulty many international companies have doing business here.

VOA: standard.2009.11.05