Oil prices face further upward pressure as they near $80 a barrel because of heavy trading in options contracts ahead of the year end, brokers and analysts said.
经纪商和分析师表示,石油价格逼近每桶80美元,并面临进一步上涨的压力,因为在年底前到期的大量期权合约的行权价格集中在这一位置。
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