The problem is simple: No one can predict accurately how long the slowdown will last. The authorities, lacking confidence in their ability to restore pre-2009 rates of annual GDP growth, have lowered the official target to 7.5%.
问题非常简单：没人能准确预测这轮经济放缓会持续多久。当局对将年度GDP增长恢复到2009年前的水平缺乏信心，因此将官方目标调降至7.5%。