The U.S. has traditionally refrained from imposing duties on supposedly subsidized imports from nonmarket economies because it's so difficult to break out what the actual subsidies are for each company and industry.
"It's so difficult to quantify, " said Alejandro Moreno, a former MLS Cup winner with Columbus and now a soccer analyst.
"It's so difficult to take other factors into account - for example, moderate drinkers might have a better social environment, " he told BBC News Online.
They country is huge, it's an unbelievably big distance between the cities and so it's difficult to control the training.
"A lot of basic things didn't work, not just about markers, but about systems and about management information, the fact it's been so difficult to know where all these scripts are, even today, and the fact that the communication was so poor, " she said.
You hear the same thing again and again: people insist that the Euro cannot fail, just after explaining why it's going to be so difficult for it to carry on.
Maybe it was a misunderstanding with Felipe or the media, so it's difficult to know what is true and what was said as later he said a different thing.
Mr. ISIKOFF: That is - it's really more the latter, and that's what makes it so difficult to get a handle on.
We live all over Scotland so it's difficult to meet up but we have vowed to have a 10-year anniversary - so we've got two years left to plan it!
I've been doing it all my life so it's going to be difficult to stop, but I'm trying.
It is an anarchist demonstration so it's very, very difficult potentially to police but I have confidence in the Metropolitan Police Service as to what happens, we'll have to wait and see.
So it's very difficult to run the table ad be undefeated all the way through.
You don't mention which tour operator (or operators?) refuse to take your bookings, so it's difficult for me to talk specifics.
Any crater would have to be buried deep beneath thousands of tonnes of dense ice, so it's difficult to know where to start looking.
Most observers believe that aggression will be left out of the court's jurisdiction because it is so difficult to define legally.
In Madrid, we have the problem of the dry climate, so it's very difficult to have the clay that settles down properly.
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So it's really difficult to predict how this case could turn out.
"I need pretty much everything doing for me, " he says, so it's very difficult if his regular carers or stand-bys aren't able to turn up.
So it's very difficult to describe it as other than a victory.
So it's difficult at this point to report actual dollars per job.
"Right now the banks are failing left and right so it's difficult to get credit, " said Small Business Administration spokeswoman Molly Brogan.
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The Lumia brand as a whole is very consistent in its overall design language, so it's not difficult to tell that the 520 fits perfectly in the lineup.
Data on manager salaries is sketchy and rarely publicized, so it's difficult to say whether managers' salaries are exploding in the same way player salaries did a decade ago.
"The problem is that the public don't understand that this is the sort of thing that we expect every year anyway, so it's very difficult to get the balance right, " he said.
Hopes were raised when the companies decided to start a late-stage trial of the drug, but data from mid-stage trials is not yet available, so it's difficult to know whether that bet will pay off.
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