This is what makes it such a difficult phenomenon to investigate.
This is a simplified version of a difficult phenomenon when it takes hold in a large group.
"The number of fatalities we have had shows they're a difficult phenomenon for us to understand," said Karl Birkeland, an avalanche scientist at the Forest Service's National Avalanche Center here.
Mr Tate said: "For years we have had a problem with both sides in this debate – those who allege a massive international conspiracy of Satanic abusers and those who say it is all nonsense – drowning out any sensible debate of a very difficult phenomenon.
One difficult phenomenon to classify is transference of sense or reference (see Nunberg, Ward).
Coating of hard powder materials on hard substrate using kinetic spray technique has also been considered a difficult phenomenon.
"The fish could potentially do extraordinary things for our understanding of whales," expand CSAIL head Daniel Rus, adding that whale births have been an extremely difficult phenomenon to capture on video.
Subsequently, growth of damage inflicted during manufacturing or accidental damage inflicted in service can be a difficult phenomenon to come to grips with and often requires an inspection method that is sensitive to internal damage.
Some members of the CHMT remarked: " Appeal is a very difficult phenomenon.
Infertility is a difficult phenomenon to accept because of the complex psychosocial issues faced by infertile clients.
