Bridging the urban-rural gap in China is a historic task.

缩小中国城乡差距是一项历史性的任务。

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A problematic task was defined as one for which a significant gap existed between its estimated implementation time and the actual time it took to accomplish it.

未决任务被定义出来因为在估算实现时间和实际完成时间之间存在显著的差异。

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Uncertainty over the size of the output gap complicates the task of central Banks.

产出缺口不确定，央行任务更头疼。

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Policymakers face a daunting task in closing the yawning gap between revenues and expenditures in the coming years, but targeting medical innovation is a particularly counterproductive approach.

FORBES: Beyond The Fiscal Cliff, Pharmaceutical Innovation Is The Key To Long-Term Fiscal Health

To bridge the gap, Mr Kim has set up a task-force to prepare for a smooth transition of the presidency.

ECONOMIST: Korean glums

Moreover, the rats that successfully completed the more difficult task, which involved a longer gap in time between the sound and the puff of air, had retained more new neurons than those assigned easier tasks, with shorter gaps.

ECONOMIST: Neuroscience (2)