4. China’s gross domestic product (GDP) will grow about 9 percent next year, but the economy will be challenged by rising labor costs, liquidity problems and difficulty in sustaining rapid growth in the long run, a senior researcher at the country’s top think-tank said Saturday. 译文：中国高层智囊团的高级研究员周六表示，中国 明年GDP增幅大约为9%,但中国经济面临劳动成本增 长、流动资金问题和难以保持长期快速发展等挑战。