The main challenge to the old order is Podemos.
The "ally"? -What is the main challenge to the article's main character?
It constitutes the main challenge to Mr Abhisit's ruling Democrat Party.
For Miller, as for any novelist, the main challenge to imagination lies in creating and maintaining a compelling narrative voice.
"Their gigantism creates the main challenge to this operation, because it's like raising from the ground a floating city.
"The main challenge to overcome was the fact that CharityClear was a bold idea whose operations were nothing to do with epilepsy," he explains.
Along with Jenny Beavan (eight nominations, one win), Powell is the UK's main challenge to Hollywood's finest costume designers, the likes of Albert Wolsky and Colleen Atwood.
The main challenge to Mr Schröder looks set to come, not from the Greens or the ousted opposition, but from the ranks of his own party.
Everyone suspected the main challenge to Tiger Woods's supremacy would come from someone whose performance arc, with all its ups and downs, could pass for an electrocardiogram.
What this co-production (from Sheffield's Crucible, Coventry's Belgrade and Eclipse theatre) draws out clearly is the main challenge to the characters – to change the world, starting with themselves.
Henry Holland, the designer who first started selling his bold T-shirt designs on Myspace, said he found the main challenge to be keeping up with the development of technology.
