Several decades ago, many people considered rising population to be the main challenge facing humanity.
The main challenge is overcoming viscousity, which means that completely different engineering principles are involved.
The main challenge is to ensure the healing agent is robust enough to survive the mixing process.
The main challenge for British firms, by contrast, is getting hold of workers with the right skills.
The main challenge is the lack of alignment between infrastructure strategies and the need to expand engineering training.
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The main challenge, we thought, would be to meet demands for better public services without spending more money.
The main challenge, he said, is that the company has to consult many lawyers to negotiate rights issues with game publishers.
"The main challenge is making security techniques lightweight, but apart from that people shouldn't be overly worried about security issues, " said Randell.
Providing quality meals at an altitude of 35, 000ft is the main challenge.
The main challenge will be to reduce the price of access devices.
The main challenge for these Governors will be making the political sale.
Without a doubt, the main challenge for Livestrong will be to reinforce the mission, which must be larger and devoid of Lance Armstrong.
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O'Grady said what was once considered the main challenge -- of producing future stars to maintain the sport's profile -- has already been addressed.
The main challenge to building a tractor beam is pretty intuitive.
The main challenge seemed to be rendering maps in real time.
"The main challenge will be in the rapid scaling up of these experiences, through knowledge dissemination and strong public policies, especially in developing countries, " says Paillard.
The fight against the use and the trade of prohibited substances and methods is today the main challenge to curb the scourge of doping in sport globally.
WSJ:The main challenge in finding investments in China seems to be that many companies have grown rapidly to a certain size, but governance has not kept up pace.
"For Facebook the main challenge is not just to grow in terms of numbers, but more importantly to deepen and enrich engagements, " said Eden Zoller, principal analyst at tech research firm Ovum.
The main challenge facing the agriculture sector will not be so much to grow 70% additional food in the next 40 years as to make 70% more food available on the plate.
However, according to the Report, the main challenge the world now faces is not as much growing the 70% additional food in 40 years, but making 70% more food available on the plate.
The main challenge for CEO Tim Cook and Apple longer term is whether or not he and the company can continue to foster the same culture of innovation and consumer-focused product development that made Apple what it is today.
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The campaign in the coming weeks will continue to focus on the two candidates' plans to fight what is widely considered the main challenge for Guatemala's next president: violent crime and the increasing presence of organised criminal groups in the country.
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"This has been the main statistical challenge, accurately estimating the figures for countries where no records exist, " says a FIFA spokesman.
Speaking of Absolution, the scores you achieve in the sniper challenge boosts your scores in the main game.
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The Argentine is playing only his second season on the main European circuit after performing well on the Challenge Tour.
The mistakes came to light after rival bidder Virgin Trains, which has run the West Coast Main Line since 1997, launched a legal challenge against the decision.
As Scotland has bowed out of two of the three main international education surveys, it is a challenge to offer a clear picture of the current state of play in school education, apart from exam results.
As far as the media is concerned, the main reason Linux is a credible challenge is because it is getting vocal and financial support from major corporations like Intel, IBM, Oracle, Informix, and Corel.
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