General Myers acknowledges that process has been made more difficult by the uncertain outcome of the Afghan presidential election, and allegations of widespread fraud by supporters of President Hamid Karzai.

VOA: standard.2009.10.16

He was able to do this even in the difficult positions demanded by the part.

VOA: special.2010.03.07

He says those questions became even more difficult to answer after the 9/11 attacks by a group of Sunni Arab terrorists that killed 3,000 people on American soil, and after the massive U.S.military deployments in Afghanistan and Iraq.

VOA: standard.2010.03.18

A newly released history of 20th Century Russia, written by a team of 45 scholars and edited by historian Andrei Zubov, includes a statement that much of the country's recent past is painfully difficult to study, which is why many refuse to do so.

VOA: standard.2009.12.25