English to Chinese Bus/Financial Investment / Securities gas prices

Statistically, there is some correlation between rising futures volumes and rising oil prices (though it's hard to prove which is cause and which is effect). And there is at least one area where momentum buying by futures traders almost certainly has an impact. In the oil market, if futures prices are higher than the current spot ones - a condition commodity gurus call "contango" - that indicates a belief that spot prices will move higher.