For example, the sudden move in the crude oil curve from contango to backwardation last year has its origins in the steady reduction in OPEC and specifically Saudi Arabian crude oil production.

• 举例来说，2007年，原油远期价格曲线之所以由期货升水状态突然转变为现货升水状态，其根源就在于欧佩克、尤其是沙特的稳步减产。