"Offences of this nature are easy to commit but very difficult and very expensive to detect, " he said.
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But we have to make a series of collective but very difficult decisions to get our fiscal house in order.
It's simple to say, but very difficult to bring off, something that cannot be taught and really is hard to pin down, and it either works or it doesn't.
If it were easy to become rich we all would be, but as the rich and poor alike know intimately, getting rich is surely glorious, but also very difficult.
Mr. AL-RUBAIE: I think it's very well said, but it's very difficult to do a proper assessment while we are going to the election from public relation exercise, the media.
Security services say they receive a steady stream of threats but find it very difficult to pick out the credible ones.
But it is very difficult to estimate size of a species from a distance - especially if you are unfamiliar with them.
"We've made some progress with a third party but it is very difficult because of all of the formalities involved, " he said.
Professor Chapman said the web had made information accessible to millions around the world, but it was very difficult to institute a system of quality of control.
But causation is very difficult to attribute in these cases.
The Near Earth Object (NEO) database is working to do that, but it is very difficult to locate all of the objects either closer to the sun or behind it.
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Then Amandine asked them which houses supplied Champagne for supermarket brands (a practice many in the industry thoroughly detest, but it is very difficult to observe who is hiding behind those supermarket labels).
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As far as targeting parents goes, it is all very well to try to target the parents of young children to try to get them to do things in different ways, but it is very difficult satisfactorily to punish parents who won't keep control of their children.
"It's very slow and it's very difficult, but it's also very exciting because you get these great breakthroughs".
The Epping Forest MP argued that new laws would have "very little effect" on responsible dog owners but would make life "very difficult" for those who do not look after their dogs properly.
On Afghanistan, we are in the midst of a very difficult but very important project.
But it's very difficult for me to imagine the new Congress enacting new gun laws.
"They could have gone there, but it would be very difficult to sell them openly, " he said.
The game was very difficult but at the end we are happy for the performance of our players.
"We have enough (international telephone) circuits but it's very difficult to get connected to the local network in the U.S., " Cheng said.
Carbon taxes may be the answer, but the politics remain very difficult.
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It is still not known why the control mechanism breaks down in some people, but the results are very difficult to treat.
But it's very difficult to get trained staff to run a fistula hospital, because of the lack of available education in Africa, he says.
But it makes it very difficult to get a clear picture of how Zetia will perform for Schering-Plough, or of the company's future in general.
But that may prove very difficult with serious federal charges against their most outspoken and visible leader and an election year just around the corner.
Workers can just move and find jobs on their own, but it's very difficult to secure residency and a work visa in many European countries, says Ms. Berdan.
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Downing Street sources say the prime minister believes the situation is "very difficult, very serious" but the BBC has the capacity to reform itself and to address failings.
They have been asking the U.S. forces at checkpoints not to search the Iraqi women, but that is a very difficult problem that coalition security forces will have to work out.
Jonathan Kent says research has linked growing commercial pressures on children to higher rates of depression, lower self-esteem and to mental health problems but that it is very difficult to prove such a link.
But that would be very difficult to do, would create a lot of bureaucracy, would lead to formula fights among advocates of beneficiaries in different demographics and could allow states to game the system, he said.
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