Peasant problem is the main problem of China.

农民问题是中国的主要问题。

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In the past half century, the main problem of China economy is unsteadiness.

在过去的半个多世纪里，中国经济多次出现大起大落。

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A: the core problem of China-Japan relations is that Japan should rightly treat the issues left by the history.

答：中日关系的核心问题是日本要正确对待历史的问题。

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Today,the number is still 40 percent. Part of the problem is that a number of big importers, such as China and Japan, are not doing enough to stop the import and sale of illegal timber.

VOA: standard.2010.07.28

Economist Vincent Chan from Credit Suisse in Hong Kong believes the main problem for the government is to manage expectations of the second generation of migrant workers who form the back bone of China's success.

VOA: standard.2010.06.24

The pesky problem of China's undervalued currency just won't seem to go away.

FORBES: Magazine Article

The region acknowledges Taiwan to be an internal problem of China, but one that has grave implications for all East Asia -- because of the island's strategic location and its importance to regional commerce.

CNN: VIEWPOINT

Wang Hongguang, director of the National Centre for Biotechnology Development, admits that originality is still a problem for many of China's scientists.

ECONOMIST: Chinese biotechnology