WASHINGTON - US Trade Representative Robert Lighthizer on Monday (Sept 18) zeroed in on China, calling it an unprecedented threat to the world trading system.（美国贸易代表指责走国对全球贸易体系构成空前威胁） "The sheer scale of (China's) coordinated efforts to develop their ec...全文： http://m.weibo.cn/5506682114/4153716057131978 ​