The price of West Texas Intermediate crude oil had been rising steadily this week as Tropical Storm Gustav gathered strength.
随着热带风暴古斯塔夫不断积蓄力量，西得克萨斯中质油的价格也在本周稳步攀升。
Oil prices fell to their lowest level in 12 years; futures of West Texas intermediate crude closed at $31.41 a barrel, down 5.3 percent.
石油价格跌至12年来的最低水平，西德克萨斯中质原油（West TexasIntermediate）期货报收每桶31.41美元，下挫了5.3%。
Oil prices fell to their lowest level in 12 years; futures of West Texas intermediate crude closed at $31.41 a barrel, down 5.3 percent.
石油价格跌至12年来的最低水平，西德克萨斯中质原油（West TexasIntermediate）期货报收每桶31.41美元，下挫了5.3%。
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