China has kept its export engine roaring with a combination of tax rebates and a weak currency, helping sustain economic growth at home while sending a surge of Chinese goods into markets abroad. 中国借助出口退税与货币疲软的双重策略维持了其出口引擎的强劲运转，在支撑国内经济增长的同时，也将大量中国商品推入海外市场。…