Imagine you are about to take a difficult test, or undergo a grueling interview.
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World No.2 Federer knows formidable Czech Berdych will offer a difficult test as he bids fora place in the final and his 77th career title.
The police authority said Mr Crompton had "fantastic credentials and experience" and faced a "difficult test in guiding South Yorkshire Police through a tough economic climate".
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Charles Francis , a professor of medicine at the University of Rochester who headed up this clinical trial, says that these results are especially promising because orthopedic surgery is a difficult test of an anticoagulant.
Tony, a tough little Cockney from London's East End, wanted to be a jockey and didn't make it, but he managed to pass The Knowledge, the formidably difficult test for London taxi drivers, then buy his own taxi and earn a good living for himself and his family.
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Of course, other things seldom stay constant in the real world, so the law of demand is sometimes difficult to test.
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Vaccines are notoriously difficult to test: Instead of simply measuring signs of healing, a negative must be proven--that someone won't get a disease.
Some immigrant rights groups say the new test is too difficult.
In low- and middle-income countries, where public resources are especially tight, regulatory constraints have made it difficult to quickly and efficiently test, approve, and ensure the quality of medicines that people need.
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Technically, it's not difficult at all to do a test for these genetic mutations.
This is because a test ban raised some difficult technical challenges that needed to be surmounted before Senate approval.
But the size of test centre sites made it difficult to reach the speed without accelerating unsafely, he said.
Plans to overhaul the Kent 11-plus test and make it more difficult for wealthier families to coach their children are being considered.
"The conditions were difficult today, but it was a good test, " said Sharapova, who lost only five games in her previous three matches.
The current CL is a true test of quality over a consistently difficult season involving the best teams in the world, and don't forget it.
It is difficult to diagnose mitochondrial diseases and the only current test is a muscle biopsy.
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While U.S. officials said there is "nothing to indicate" that North Korea can or will place a nuclear warhead atop a missile right now, most experts say it is very difficult to know the warhead and payload of a missile test in advance.
Australia's Test captain Steve Waugh said Warne could find it difficult to come back from the ban.
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Also, these were areas where there were "clear right or wrong answers" - unlike in the creative writing test, which teachers had complained was subjective and difficult to judge consistently.
But ImClone is also trying to test a newer version of Erbitux it owns entirely--a difficult prospect given Erbitux's entrenched status, but still a threat to Bristol.
"Because the depth of the test is not known and the geology of the test site is uncertain, translating the seismic magnitude into yield is difficult, " said Acton, the Carnegie analyst.
The Commission will comprise of senior legislators from G8 countries and the major emerging economies of Brazil, China, India, Mexico and South Africa to identify the most difficult domestic obstacles, and to explore in-depth, as well as politically test, the specific outcomes required from the G8 summit.
So far, each of the 10 Test teams has yet to play all of the others, so comparisons are difficult.
It's difficult to say whether this will be that useful in real life, but we'll need to test it out for an extended period to find that out.
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