Food was a big problem in China in the past.

在过去，粮食是中国的一个大问题。

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I see. Pollution is a big problem in China, especially in the cities.

在中国，污染是个大问题，尤其是在城市里。

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Poverty is a big problem in the world, but China has done a good job to deal with it and made the proud achievement.

贫困是世界上的一个大问题，但中国在处理这个问题上做得很好，取得了令人骄傲的成就。

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In the emerging markets inflation is the big problem, particularly in China (see chart).

FORBES: Magazine Article

Part of the problem in China is that running a big company even a giant such as China Telecom, with its 220m customers still has a lower status than a political job such as governor of a province.

ECONOMIST: The empire strikes back

The big problem, he says, is the complete lack of any concept of civil society in modern China, that space between the individual and the government that has long been filled in the West by religious or civic organizations.

NPR: One Man Against AIDS in China