但过去几周油价进一步暴跌 — — 跌到了2008年全球金融危机爆发后的所达到的低位 — — 原因何在，对世界经济会造成怎样的影响？
But what accounts for the further plunge in oil prices in the last few weeks – to lows last seen in the immediate aftermath of the 2008 global financial crisis – and how will it affect the world economy?