These include trouble walking, weakness especially on one side of the body, difficulty seeing and difficulty speaking.

VOA: special.2009.08.12

The cost depends on the difficulty of the subject and how soon the paper is needed.

VOA: special.2009.04.23

For five days, through one crisis after another, the Apollo 13 crew and mission specialists on the ground worked through each difficulty.

VOA: standard.2010.04.04

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