Nevertheless, the paucity of natural ingredients necessarily would have placed difficult-to-overcome limits on the existence of life at the surface of Mars, especially after the Noachian/Early Hesperian period [although there has been a suggestion that its surface may have been oxidizing, Tuff et al. (2013)].
"My term has... had substantial political and media challenges" that "have placed new and difficult pressures on my office," Dynes wrote in his 13 August letter of resignation to the Board of Regents.
These problems have placed Dell in a difficult situation since it gets all of its chips from Intel, the world's largest maker of microprocessors.
"Anyone following this case must have recognised that if there was a second appeal it may not have sustained a conviction, and that would have placed everyone in a very difficult position.
Difficult Terrain Rebels have placed roadblocks on the access roads into the mountains.
"We are dealing with both industry issues and company-specific issues, most importantly past pricing practices that have placed the company in an especially difficult position," Trevor Fetter, the acting chief executive, said in a statement.
Repeated car bombings and attacks on American soldiers, coupled with a growing sense in Iraq and in United States of the limits of American power, appear to have placed the Bush administration in the difficult situation of recognizing a need for more troops without being able to ask for any more from the United States.
This has placed Disney in the difficult position of having to defend its municipal creation.
Porter believes Nick Clegg's party has placed itself in a difficult position.
Gondor itself, which some believe had placed Rohan in this difficult position to begin with?
"The United States has placed itself in a very difficult situation because many of the rebel groups that it wants to become principal holders of state power in Syria work hand and glove with Al Qaeda," University of Oklahoma Center for Middle East Studies Director Joshua Landis told Sputnik on Monday.
