"It is really difficult to say, " says Kathleen King, collections and science co-ordinator at Kew, where the specimens have been kept in unusually large pots for the first time.
"It is really difficult to track some of those down when all you have is a purported e-mail from somebody named Janet, and no other identifying information, " David Mikkelson said.
You see at Restaurant Med, where patrons only can speak to their wait staff about ingredients, and demand the modern but unhelpful ovens they heard about from friends and the media, it is really difficult to create meals that patrons thoroughly enjoy.
Is it really that difficult to imagine the economic carnage that would follow from raising their marginal rates?
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"It really is very difficult to manage for both doctor and patient, " says Jack Ansell, a professor of medicine at Boston University.
Ultimately, though, is it really a difficult question?
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Until Arena can really lay out all its data, it is going to be difficult to know how safe the drug really is.
In the books of Mr Lindon's authors life is never so secure: it is difficult to tell what is really happening and what is illusion.
It is difficult to tell where spending will really fall off.
"While we appreciate that this is a very difficult decision for the league and owners, we hope it is understood that we really believe the time is now to bring the NBA back to Seattle, and that it is paramount that we do everything we can to put Seattle's best foot forward in this process, " Hansen said.
"It's really difficult to predict what the future is going to bring, " says Gary Zenkel, senior VP of marketing and business development for NBC's Olympics coverage.
Outside my hotel room window, a thin layer of clouds has stolen over the valley, diffusing the light and making it difficult to see where the sun really is.
For Russia to continue to grow and develop it really is going to have to make a number of difficult, complicated, and expensive reforms to some very basic parts of its economic structure.
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Given that the mobile market is a very small value contributor to Intel and the microprocessor giant is finding it difficult to gain share, should AMD really divert some of its resources to pursue this crowded space?
"In the build-up to a tournament it is difficult but once it starts it doesn't really become a problem, " he said.
While it's difficult to really get a handle on what is holding up the works, it seems like the requirement for OCAP support is the biggest point of contention.
" The AP quoted the movie star as emoting, "It is difficult for me to talk to you because I really feel duped...but more importantly I feel that you betrayed millions of readers.
In many families, if they are unemployed and something catastrophic happens, someone is diagnosed with cancer or some other really difficult disease, it can bring the family to bankruptcy.
Many IT management techniques hold this out as a goal, but to really achieve this understanding is difficult.
It is difficult to tell if the people who upload their pictures to this site are really plane geeks at all, I suspect they may be photo geeks on an aeroplane site because some of these pictures are beautiful.
Mr. ISIKOFF: That is - it's really more the latter, and that's what makes it so difficult to get a handle on.
Proponents of the bill would really like to do away with electoral voting altogether but, realizing how difficult it is to gain the two-thirds vote of both houses of Congress to approve and three-fourths of state legislatures to ratify a Constitutional amendment, have instead devised this clever end-run.
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You should really check it out, Engadget readers took some really phenomenal photography -- which is exactly why we had such a difficult time deciding who should take home the prize.
"In the heat of battle when support is needed very quickly, nine times out of 10 it really does help to get troops out of very difficult positions, " he said.
"It has been a very long and difficult winter, but now the waiting is finally over and I am really excited about tackling my second season with Scuderia Toro Rosso, " he said.
And it's very difficult for the civil liberties organizations to get past this because the standard of proof is not really clear.
"It is difficult - there are a huge amount of lines to learn, that's not necessarily a burden really, " said Dunbar.
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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.
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