Marseille coach Didier Deschamps added that the postponement of the game "was difficult to understand".
This is a point very difficult to understand for industry producers, according to Valenzuela.
But scientific information can be difficult to understand and even more difficult to explain to others.
It is difficult to understand why the event did not receive the coverage it deserved.
Quite why anyone thinks this is a threat to public services is difficult to understand.
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Many foreigners are surprised that our national characteristics are sometimes very difficult to understand.
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It is more difficult to understand why Ms Kroes has decided to push the case.
However, the domains that have commercial value are relatively few in number and not that difficult to understand.
It is difficult to understand but you have to go out there and live it and do it.
What I find so difficult to understand about the whole thing is, well, what actually is the story?
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Systems innovations are far more difficult to understand and support, and that puts them in danger of neglect.
The path of the mortgage rate might be difficult to understand, so we will explain with an example.
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However, Peter Barclay, from the Gatwick Area Conservation Campaign, said the claim of economic benefits is "difficult to understand".
Some others try to invent new problems, with solutions that are difficult to understand and explain for normal users.
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Their shift pattern, some parts of it are very, very difficult to understand.
As a young boy, Whitaker found it difficult to understand what had happened.
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Hell, without prices, release dates, pictures, or any real details it's difficult to understand what they've got in store for us.
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This is why it has been so difficult to understand precisely what is broken and how it can actually be fixed.
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This makes their economics opaque: it is very difficult to understand what drives costs and whether prices are reasonable and necessary.
"For me it's very difficult to understand where the news starts because I never speak about my retirement, " the 33-year-old said.
Keir Hardie may have liked Mr Blair, but he was not like him, and would have found him difficult to understand.
It is very difficult to understand what point you were trying to make, your blog meandered over quite a bit of territory.
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It's a situation that's difficult to understand considering Venezuela is a petro-state with the largest proven reserves of oil on the planet.
Sometimes the words are difficult to understand or are prayed in flat and boring tones as though the celebrant doesn't believe them.
Houghton didn't act soon enough, but it's not difficult to understand why he held off, hoping that the economy would pull him through.
We get irritated when CSRs are difficult to understand and irritated when CSRs fail to solve what ought to be a simple problem.
Solomon had previously invested with financial advisory firm Edward Jones, but says it was difficult to understand what he held in his account.
Of the massive security surrounding the series, Mr Cork said it was "very difficult to understand how it's happened and why it's happened".
Zhao says his aim is to make real a problem that many have talked about but at times gets a little difficult to understand.
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In the film, sister Hilary allows the affair to continue because of her sister's frail emotional state, something Rachel Griffiths finds difficult to understand.
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