But the industry is finding it difficult to sustain growth rates in the developing markets.
Now, a commitment to interpersonal contact can be difficult to sustain on a global scale.
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The question Christensen began with, twenty years ago, was: Why was success so difficult to sustain?
However, this model is dependent on limited donor funding and may be difficult to sustain in the long-run.
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The danger now is that even these roles will prove difficult to sustain.
While that is an encouraging sign, output is growing at rates that make it difficult to sustain the current unemployment rate.
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Some of those tough choices proved difficult to sustain over the years.
The ideal of sustainability, it turns out, is difficult to sustain.
But caching is effective only if it can keep up with the Web's annual tenfold growth, and that may be difficult to sustain.
Put another way, it is difficult to sustain participation in a relatively open, transparent international order while stifling such an environment at home.
The authorities' actions in Tibet are likely to increase public antagonism toward the government and make stability more difficult to sustain in the long term.
This incident will surely make the embargo more difficult to sustain.
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However, he cautioned that when interest rates ultimately start to rise again as the wider economy recovers, the strong house price increases of recent months "would become difficult to sustain".
"In recent years we have been the most lucrative major championship in dollar terms but with the shift in the exchange rate that may be difficult to sustain, " said Hill.
And he has done so at just the moment when even the most determined apologists were finding it difficult to sustain the fiction required for moral equivalence between the aggressors and their victims.
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But Roy Miller said that she had not received so definitive a diagnosis, and that, in any case, it could be difficult to sustain in court the notion that Amy was beset by extreme delusions.
Most of those cuts will come in Europe, which will make the U.S. presence in the Balkans increasingly difficult to sustain and raise doubts about Bush's commitment to NATO, much less to an enlarged NATO.
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Lib Dem members are thought likely to resist any alliance with the Conservative party, but Mr Clegg may find it difficult to sustain a Labour government in power if they are not the largest party, as the polls suggest may be the case.
Owing to this, it may be difficult for Israel to sustain a bilateral alliance with China over time.
Abe has pledged to boost Japan's competitiveness and push ahead with difficult reforms needed to sustain growth in the longer run, while at the same time stimulating demand at home through higher public works spending.
The big fear in the region is that the longer the recession lasts, the more difficult it will be to sustain government spending without additional aid.
We now know that such euphemisms have merely served to confuse the American people and made it far more difficult to develop, and sustain popular support for, the counter-ideological warfare our actual Islamofascist enemies require.
Just watch one woman saying how difficult is for her to sustain when she does not have electricity at home and she has go travel long to fetch kerosene oil to light up her lamp at night.
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The move effectively cut Pyongyang out of international financial markets, making it far more difficult for the North Koreans to sustain the regime financially.
"It's been difficult for us as Interpol to sustain our activities" against counterfeiting over the years, she said, because the agency's limited resources also are needed for areas the international community sees as more serious crimes.
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