As the century turns, migration, with its inevitable economic and political turmoil, has been called "one of the greatest challenges of the coming century".

随着世纪交替，移民及其不可避免的经济和政治动荡被称为“下个世纪最大的挑战之一”。

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Sub-Saharan Africa faces the greatest challenges.

撒哈拉以南非洲面临最大的挑战。

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These are some of the greatest challenges we need to address.

这些是我们需要解决的重大挑战的一部分。

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One of the greatest challenges will be making enough trained teachers and facilities available in state-run schools, especially in rural areas.

VOA: standard.2010.04.01

He says young Muslims are often confused by disturbing Internet images of their brothers in faith being killed in conflicts, and that one of his community's greatest challenges is helping young people interpret current events.

VOA: standard.2009.12.20

The mayor hopes to make London one of the greatest cycling cities in the world, even so,riding a bike through the capital has its challenges.

VOA: standard.2010.07.30

Professor Lloyd said the marine environment represented one of the greatest challenges for modern society.

BBC: Environment Committee

Mr Coles said United Learning had always aimed to work with schools facing the "greatest challenges".

BBC: Richard Rose Academy: United Learning takes over school

And moving forward, what are your greatest challenges, do you think, to deal with this threat?

WHITEHOUSE: Press Briefing with Ben Rhodes and Admiral Robert Willard